Indoor (Ducted): ARTH18KMTAP, ARTH24KMTAP, ARTH30KMTAP, ARTH36KMTAP, ARTH45KMTAP, ARTH54KMTAP
Outdoor (Single type): AOTH09KBTA, AOTH12KBTA, AOTH18KBTA, AOTH24KBTA, AOTH30KBTA, AOTH36KBTA, AOTH45KBTA, AOTH54KBTA
Outdoor (Single type): AOTH24KCTA, AOTH30KCTA
Wall Controller (Wired): UTY-RNRYT5 (UTY-RNRT series display style)
Refrigerant: R32
Audience: Authorised service personnel and licensed installers only

Contents

  1. Safety and compliance
  2. R32 refrigerant requirements
  3. Tools and materials (R32/R410A rated)
  4. System overview (power, control, commissioning flow)
  5. Refrigerant piping requirements
  6. Electrical requirements
  7. Outdoor unit installation
  8. Indoor unit installation
  9. Pressure test, evacuation, commissioning
  10. Additional refrigerant charging
  11. Indoor function settings
  12. Test run and handover
  13. Pump down (forced cooling operation)
  14. Error codes (indoor/outdoor consolidated)
  15. UTY-RNRT specific error displays

1) Safety and compliance

WARNING: Installation and servicing must be performed by authorised service personnel and in accordance with national and regional wiring and refrigeration standards.

  • Do not energise the system until installation, pressure test, evacuation, and refrigerant charging (if required) are completed.
  • Use a dedicated power circuit protected by an isolator/circuit breaker that disconnects all poles with at least 3 mm contact separation.
  • Correct earthing is mandatory. Use an Earth Leakage Circuit Breaker (ELCB/RCD) where required.
  • Do not install where combustible gas can accumulate, where flammable aerosols/solvents are present, or where ignition sources may be introduced.
  • Do not touch heat exchanger fins (sharp edges).

2) R32 refrigerant requirements

R32 is a flammable (A2L) refrigerant. Apply flammable refrigerant service practices at all times.

  • Use only R32/R410A rated tools, gauges, hoses, and recovery equipment (pressure-rated and compatible).
  • Ensure ventilation is adequate. Keep all ignition sources away from the work area (open flames, sparks, powered heaters, etc.).
  • When brazing: purge with oxygen-free nitrogen during brazing, then vent to atmosphere and pull vacuum. Repeat purge/vacuum cycles as required to remove residual refrigerant and contaminants.
  • Prevent air ingress. Avoid leaving piping open to atmosphere (cap/plug immediately).
  • Recovery cylinders must be approved and correctly labelled. Do not overfill cylinders.
  • After service/decommissioning, label equipment as decommissioned/emptied and record date and sign-off.

3) Tools and materials (R32/R410A rated)

  • Gauge manifold and charging hoses rated for R32/R410A
  • Vacuum pump (with non-return/check valve recommended) and vacuum-rated hoses
  • Electronic scale for charging
  • Oxygen-free nitrogen cylinder with regulator (for pressure testing and brazing purge)
  • Leak detection method (electronic detector suitable for A2L, and/or bubble solution)
  • Torque wrench and flare tools suitable for R32/R410A
  • Hexagon wrenches for service valves (including 4 mm where specified)
  • Insulation materials (closed-cell), UV-resistant tape, putty/sealant for penetrations
  • Electrical tools: insulation resistance tester (megger), multimeter, crimp tools, correct terminals

4) System overview (power, control, commissioning flow)

Architecture: Single split system (ducted indoor + outdoor). Outdoor unit is the primary power supply point. Indoor-to-outdoor interconnect carries control/communication and (where applicable) supply as specified by wiring design.

Basic flow:

  1. Mount indoor unit, hang/level, connect condensate drain, duct connections, filter access.
  2. Mount outdoor unit, clearances, vibration isolation, service access.
  3. Run refrigerant piping (liquid and gas), braze/flare per requirements, insulate both lines.
  4. Complete electrical wiring (power, earth, interconnect, controller as required).
  5. Pressure test with nitrogen (airtightness test).
  6. Evacuate to deep vacuum (target –0.1 MPa / –76 cmHg as specified).
  7. Open service valves fully, confirm stable vacuum hold and no leaks.
  8. Additional charge (if piping exceeds pre-charge length) using weighed charge.
  9. Function settings (indoor and controller), then test run and handover.

5) Refrigerant piping requirements

5.1 Pipe sizes by model (no abbreviations)

Indoor unit connections (ARTH series):

  • ARTH18KMTAP: Liquid pipe 6.35 mm (1/4), Gas pipe 12.70 mm (1/2)
  • ARTH24KMTAP: Liquid pipe 6.35 mm (1/4), Gas pipe 12.70 mm (1/2)
  • ARTH30KMTAP: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8)
  • ARTH36KMTAP: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8)
  • ARTH45KMTAP: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8)
  • ARTH54KMTAP: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8)

Outdoor unit piping limits and sizes:

AOTH09KBTA, AOTH12KBTA, AOTH18KBTA, AOTH24KBTA

  • AOTH09KBTA: Liquid pipe 6.35 mm (1/4), Gas pipe 9.52 mm (3/8); Maximum piping length 20 m; Maximum height difference (Indoor to outdoor) 15 m
  • AOTH12KBTA: Liquid pipe 6.35 mm (1/4), Gas pipe 9.52 mm (3/8); Maximum piping length 20 m; Maximum height difference (Indoor to outdoor) 15 m
  • AOTH18KBTA: Liquid pipe 6.35 mm (1/4), Gas pipe 12.70 mm (1/2); Maximum piping length 30 m; Maximum height difference (Indoor to outdoor) 20 m
  • AOTH24KBTA: Liquid pipe 6.35 mm (1/4), Gas pipe 12.70 mm (1/2); Maximum piping length 30 m; Maximum height difference (Indoor to outdoor) 20 m

AOTH30KBTA, AOTH36KBTA, AOTH45KBTA, AOTH54KBTA

  • AOTH30KBTA: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8); Maximum piping length (L1) 50 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 30 m
  • AOTH36KBTA: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8); Maximum piping length (L1) 50 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 30 m
  • AOTH45KBTA: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8); Maximum piping length (L1) 50 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 30 m
  • AOTH54KBTA: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8); Maximum piping length (L1) 50 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 30 m

AOTH24KCTA, AOTH30KCTA

  • AOTH24KCTA: Liquid pipe 6.35 mm (1/4), Gas pipe 12.70 mm (1/2); Maximum piping length (L1) 30 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 20 m
  • AOTH30KCTA: Liquid pipe 9.52 mm (3/8), Gas pipe 15.88 mm (5/8); Maximum piping length (L1) 75 m; Minimum piping length (L1) 5 m; Maximum height difference (H1) 30 m

5.2 Copper pipe wall thickness (R32/R410A rated)

Use only seamless copper pipe suitable for R32/R410A. Minimum wall thickness guidance:

  • 6.35 mm (1/4): minimum 0.80 mm wall thickness
  • 9.52 mm (3/8): minimum 0.80 mm wall thickness
  • 12.70 mm (1/2): minimum 0.80 mm wall thickness
  • 15.88 mm (5/8): minimum 1.00 mm wall thickness
  • 19.05 mm (3/4): minimum 1.20 mm wall thickness

5.3 Installation practices

  • Protect open pipe ends from moisture/dust at all times (cap/pinch). Pay particular attention when passing through walls and before connection to the outdoor unit.
  • Insulate both liquid and gas lines to prevent condensation and capacity loss.
  • Seal wall penetrations with putty to prevent water ingress and pest entry.
  • Do not bury outdoor unit piping for maintenance reasons.

6) Electrical requirements

6.1 General

  • Confirm local standards and select cables/breakers accordingly. Limit voltage drop to less than 2% (increase cable size if required).
  • Install a local isolator/disconnect device near both indoor and outdoor units (all poles, at least 3 mm contact separation where required).
  • Securely earth the power cable. Do not use incorrect grounding points.

6.2 Outdoor unit power supply and protection (by model)

AOTH09KBTA / AOTH12KBTA / AOTH18KBTA

  • Voltage rating: 1 phase 240 V (50 Hz); Operating range: 198 to 264 V
  • Power supply cable (selected sample): 1.5 mm² Type 60245 IEC57, 2 wire + Earth
  • Demand control signal transmission cable: 0.5 to 1.5 mm² AS/NZS 5000.2, double insulated, maximum length 30 m
  • Breaker capacity: AOTH09KBTA 10 A; AOTH12KBTA 16 A; AOTH18KBTA 16 A
  • Earth leakage breaker (RCD/ELCB): 30 mA
  • Connection cable: refer to the indoor unit installation manual for interconnect specifications

AOTH24KBTA

  • Voltage rating: 1 phase 240 V (50 Hz); Operating range: 198 to 264 V
  • Power supply cable (selected sample): 2.5 mm² Type 60245 IEC57, 2 wire + Earth
  • Breaker capacity: 20 A; Earth leakage breaker (RCD/ELCB): 30 mA
  • Demand control signal transmission cable: 0.5 to 1.5 mm² AS/NZS 5000.2, double insulated, maximum length 30 m
  • Connection cable: refer to the indoor unit installation manual for interconnect specifications

AOTH30KBTA / AOTH36KBTA / AOTH45KBTA / AOTH54KBTA

  • Power supply cable (selected sample): Single phase, minimum 4 mm² Type 60245 IEC66, 2 cable + Earth; Power supply: 1 phase 230 V
  • Breaker capacity: AOTH30KBTA 25 A; AOTH36KBTA 25 A; AOTH45KBTA 32 A; AOTH54KBTA 32 A
  • Earth leakage breaker (RCD/ELCB): 30 mA
  • Connection cable: refer to the indoor unit installation manual for interconnect specifications

AOTH24KCTA / AOTH30KCTA

  • Voltage rating: 1 phase 220 to 240 V (50 Hz); Operating range: 198 to 264 V
  • Power supply cable (selected sample): Single phase, minimum 4 mm² Type 60245 IEC66, 2 cable + Earth
  • Breaker capacity: AOTH24KCTA 25 A; AOTH30KCTA 25 A
  • Earth leakage breaker (RCD/ELCB): 30 mA
  • Connection cable: refer to the indoor unit installation manual for interconnect specifications

7) Outdoor unit installation

7.1 Location and clearances

  • Install on a rigid base capable of supporting operating weight and resisting wind/earthquake loads.
  • Provide sufficient service access for electrical panel and service valves.
  • Install in a well-ventilated location; avoid recirculation, direct exhaust into enclosed spaces, and areas accessible to the public without protection.
  • Do not tilt more than 3 degrees. Do not tilt toward the compressor side where prohibited.

7.2 Mounting

  • Use anti-vibration pads where required and ensure the unit is level.
  • Ensure condensate/drain paths (if applicable) remain clear and do not cause nuisance run-off.

7.3 Refrigerant connections

  • Confirm pipe diameters match the outdoor unit and indoor unit requirements for the specific model pairing.
  • Insulate and seal properly after leak test and commissioning.

8) Indoor unit installation

8.1 Handling and mounting

  • Hang the indoor unit using suitable threaded rod/hangers and ensure the unit is level. Provide service access for filter and electrical cover.
  • Ensure drain piping is correctly graded and trapped (where required) to prevent water leakage.
  • Connect ducts securely and ensure airtight joints to avoid condensation and loss of capacity.
  • Install air filter (optional) if specified for the application and ensure correct airflow direction.

8.2 Optional parts (air filter kit)

UTD-LFDA / UTD-LFDB air filter kit: Install the air filter component as per the kit instructions and confirm it is seated correctly before test run. Verify access for periodic maintenance.

9) Pressure test, evacuation, commissioning

9.1 Nitrogen pressure test (airtightness / sealing test)

  • Confirm both 3-way service valves are closed before testing.
  • Pressurise with nitrogen to 4.15 MPa for sealing test.
  • Apply nitrogen to both liquid and gas lines.
  • If outdoor temperature changes by 5 °C, test pressure changes by 0.05 MPa – account for temperature effects before concluding leakage.
  • If pressure drops or bubbles are observed, repair immediately and repeat the sealing test.
  • After completion, release nitrogen from both valves slowly and safely.

9.2 Evacuation (vacuum process)

  • Remove the charging port cap and connect gauge manifold and vacuum pump to the charging valve using service hoses.
  • Evacuate the indoor unit and connecting pipes until the gauge indicates –0.1 MPa (–76 cmHg).
  • Once –0.1 MPa is reached, continue vacuum operation for at least 60 minutes.
  • Disconnect service hoses and tighten the charging port cap to specified torque.
  • Remove blank caps and fully open the spindles of the 3-way valves with a hexagon wrench (use specified torque for spindle operation where stated).
  • Tighten blank caps of the 3-way valves to specified torque and confirm no leaks at caps and joints.

9.3 Commissioning checks

  • Confirm insulation is complete, penetrations sealed, and condensate drain is functioning.
  • Confirm correct wiring at terminals (match terminal numbers and colours between indoor and outdoor units).
  • Confirm service valves are fully open after evacuation and charging is complete.
  • Confirm no abnormal vibration/noise and airflow is adequate at designed outlets.

10) Additional refrigerant charging

Important: Factory charge is suitable up to the stated pre-charge length. If actual piping length exceeds the pre-charge length, add refrigerant by weight using the rate below. Always back-seat/close service valves after charging and minimise refrigerant release to atmosphere.

10.1 Factory charge and maximum charge (by model)

  • AOTH09KBTA: Maximum refrigerant charge 950 g (Factory charge 850 g + Additional charge allowance 100 g)
  • AOTH12KBTA: Maximum refrigerant charge 950 g (Factory charge 850 g + Additional charge allowance 100 g)
  • AOTH18KBTA: Maximum refrigerant charge 1220 g (Factory charge 1020 g + Additional charge allowance 200 g)
  • AOTH24KBTA: Maximum refrigerant charge 1450 g (Factory charge 1250 g + Additional charge allowance 200 g)
  • AOTH30KBTA: Maximum refrigerant charge 2700 g (Factory charge 1900 g + Additional charge allowance 800 g)
  • AOTH36KBTA: Maximum refrigerant charge 2700 g (Factory charge 1900 g + Additional charge allowance 800 g)
  • AOTH45KBTA: Maximum refrigerant charge 3500 g (Factory charge 2700 g + Additional charge allowance 800 g)
  • AOTH54KBTA: Maximum refrigerant charge 3500 g (Factory charge 2700 g + Additional charge allowance 800 g)
  • AOTH24KCTA: Maximum refrigerant charge 2700 g (Factory charge 1800 g + Additional charge allowance 900 g)
  • AOTH30KCTA: Maximum refrigerant charge 3900 g (Factory charge 2100 g + Additional charge allowance 1800 g)

10.2 Pre-charge length and additional charge rate (by model)

AOTH09KBTA / AOTH12KBTA / AOTH18KBTA / AOTH24KBTA

  • AOTH09KBTA: Pre-charge length 15 m; Additional charge rate 20 g/m beyond 15 m (up to maximum allowable piping length)
  • AOTH12KBTA: Pre-charge length 15 m; Additional charge rate 20 g/m beyond 15 m (up to maximum allowable piping length)
  • AOTH18KBTA: Pre-charge length 20 m; Additional charge rate 20 g/m beyond 20 m (up to maximum allowable piping length)
  • AOTH24KBTA: Pre-charge length 20 m; Additional charge rate 20 g/m beyond 20 m (up to maximum allowable piping length)

AOTH30KBTA / AOTH36KBTA / AOTH45KBTA / AOTH54KBTA

  • AOTH30KBTA: Pre-charge length 30 m; Additional charge rate 40 g/m beyond 30 m; Maximum piping length 50 m
  • AOTH36KBTA: Pre-charge length 30 m; Additional charge rate 40 g/m beyond 30 m; Maximum piping length 50 m
  • AOTH45KBTA: Pre-charge length 30 m; Additional charge rate 40 g/m beyond 30 m; Maximum piping length 50 m
  • AOTH54KBTA: Pre-charge length 30 m; Additional charge rate 40 g/m beyond 30 m; Maximum piping length 50 m

AOTH24KCTA / AOTH30KCTA

  • AOTH24KCTA: Pre-charge length 30 m; Additional charge rate 20 g/m (liquid 6.35 mm and gas 12.70 mm pipe set); Maximum additional charge 900 g; Maximum piping length 30 m
  • AOTH30KCTA: Pre-charge length 30 m; Additional charge rate 40 g/m (liquid 9.52 mm and gas 15.88 mm pipe set); Maximum additional charge 1800 g; Maximum piping length 75 m

10.3 Additional charge calculation

Additional charge (g) = (Actual piping length – Pre-charge length) × (Charge rate g/m)

  • If actual piping length is less than or equal to the pre-charge length: additional charge is 0 g.
  • Do not exceed the model maximum refrigerant charge.

11) Indoor function settings

Indoor function settings for ARTH18KMTAP, ARTH24KMTAP, ARTH30KMTAP, ARTH36KMTAP, ARTH45KMTAP, ARTH54KMTAP are set via the wired remote controller function setting procedure.

11.1 Function list (key items)

Function number 11 – Filter sign

  • Setting value 00: Standard (2500 hours)
  • Setting value 01: Long interval (4400 hours)
  • Setting value 02: Short interval (1250 hours)
  • Setting value 03: No indication (factory setting)

Function number 40 – Auto restart

  • Setting value 00: Enable (factory setting)
  • Setting value 01: Disable

Function number 42 – Room temperature sensor switching

  • Setting value 00: Indoor unit sensor active (factory setting)
  • Setting value 01: Both indoor unit sensor and wired remote controller sensor active
  • Note: If using the wired remote controller temperature sensor, set Function number 42 to 01 and ensure the remote controller sensor is enabled at the controller.

Function number 43 – Cold air prevention

  • Setting value 00: Enable (factory setting)
  • Setting value 01: Disable

Function number 46 – External input control

  • Setting value 00: Operation/Stop mode 1 (factory setting)
  • Setting value 01: Setting prohibited
  • Setting value 02: Forced stop mode
  • Setting value 03: Operation/Stop mode 2

Function number 48 – Room temperature sensor switching (Aux.)

  • Setting value 00: Both
  • Setting value 01: Wired remote controller (factory setting)
  • Note: This function works only if Function number 42 is set to Both (01).

Function number 49 – Indoor unit fan control for energy saving for cooling

  • Setting value 00: Disable
  • Setting value 01: Enable
  • Setting value 02: Remote controller (factory setting)
  • Detail: When enabled, the indoor fan runs intermittently at very low speed when the outdoor unit stops during cooling operation. When set to Remote controller, enable/disable is controlled at the remote controller (if supported).

Function number 60 – Switching functions for external output terminal

  • Setting value 00: Operation status (factory setting)
  • Setting value 09: Error status
  • Setting value 10: Fresh air control
  • Setting value 11: Auxiliary heater

11.2 Static pressure (external static pressure) settings

Function number 26 – Static pressure

  • Manual setting values (Pa): 50 Pa (05), 60 Pa (06), 70 Pa (07), 80 Pa (08), 90 Pa (09), 100 Pa (10), 110 Pa (11), 120 Pa (12), 130 Pa (13), 140 Pa (14), 150 Pa (15)
  • Setting value 31: Standard 50 Pa (factory setting)
  • Setting value 32: Automatic airflow adjustment
  • Allowed range of static pressure: 50 Pa to 150 Pa

Automatic airflow adjustment procedure (Function number 26 = 32):

  1. Ensure dampers are open (if installed), air filter (optional) is attached, and inlet/outlet throttles are set to the designed airflow distribution.
  2. Set Function number 26 to Setting value 32 (Automatic airflow adjustment).
  3. Run the air conditioner in Fan mode (High). During adjustment the mode is fixed at Fan (High). Do not operate the outdoor unit during this function.
  4. The air conditioner runs for approximately 1 to 8 minutes then stops automatically (group control may take about 10 minutes).
  5. Turn the air conditioner off and on again, then check the resulting Function number 26 setting value. Record the obtained setting value. If unchanged, repeat from step 1.
  6. If the detected setting value is not within the static pressure range, correct duct/outlet installation and repeat.

12) Test run and handover

  • Confirm all covers are fitted, wiring is secured, and insulation is complete.
  • Confirm no refrigerant leaks (joints, caps, valves).
  • Confirm drain operation (no water leakage).
  • Run test operation from the wired remote controller and verify: cooling/heating response, fan speeds, no abnormal noise, correct airflow, and stable operation.
  • Explain basic operation and filter maintenance intervals to the customer. Provide manuals and warranty/service information per company process.

13) Pump down (forced cooling operation)

13.1 AOTH09KBTA / AOTH12KBTA / AOTH18KBTA / AOTH24KBTA (forced cooling via indoor MANUAL AUTO)

Use forced cooling to recover refrigerant prior to pipe removal. Do not perform pump down if there is no refrigerant in the circuit (bent/broken piping) and confirm no leaks before starting.

  1. Conduct preliminary operation for 5 to 10 minutes using forced cooling operation.
  2. Start forced cooling: keep pressing the indoor unit MANUAL AUTO button for more than 10 seconds. The operation indicator and timer indicator lamps flash simultaneously during test run.
  3. Close the valve stem of the 2-way valve completely.
  4. Continue forced cooling for 2 to 3 minutes, then close all valve stems on the 3-way valves.
  5. Stop operation: press START/STOP on the remote controller, or press MANUAL AUTO on the indoor unit (no need to hold longer than 10 seconds to stop).
  • During pump down, ensure the compressor is turned off before removing refrigerant piping.

13.2 AOTH30KBTA / AOTH36KBTA / AOTH45KBTA / AOTH54KBTA (outdoor pump down button)

  1. Confirm both 3-way valves (liquid side and gas side) are open.
  2. Turn power on and wait at least 3 minutes after power on.
  3. Press the outdoor unit PUMP DOWN button (S130) for 3 seconds or more. Fans and compressor start operating.
  4. When the LED display indicates the correct stage, close the 3-way valve on the liquid pipe side tightly. If the liquid valve is not closed, pump down cannot be performed.
  5. When the LED display changes to the next stage, close the 3-way valve on the gas pipe side tightly to prevent refrigerant flow back after compressor stops.
  6. After approximately 1 minute, the LED display changes to the completion pattern. Fans and compressor stop automatically.
  7. If pump down completes successfully, the outdoor unit remains stopped until power is turned off.

13.3 AOTH24KCTA / AOTH30KCTA (pump down method)

Follow the pump down procedure specified for the outdoor display board. Where a PUMP DOWN function/button is provided, the process mirrors the AOTH30KBTA / AOTH36KBTA / AOTH45KBTA / AOTH54KBTA method (close liquid valve first, then gas valve at the indicated stage).

14) Error codes (indoor/outdoor consolidated)

14.1 Indoor unit error codes (ARTH18KMTAP / ARTH24KMTAP / ARTH30KMTAP / ARTH36KMTAP / ARTH45KMTAP / ARTH54KMTAP)

All codes below are shown as a two-digit code. Each item is provided on one line as required:

  • 11 – Serial communication error
  • 12 – Indoor unit capacity error
  • 15 – Outdoor unit error
  • 16 – Outdoor unit main PCB error
  • 18 – Compressor motor control error
  • 21 – Unit number or refrigerant circuit address setting error
  • 22 – Indoor unit capacity error (duplicate)
  • 23 – Combination error
  • 24 – Connection unit number error in wired remote controller system
  • 26 – Indoor unit and remote controller setting error
  • 27 – External communication error
  • 29 – Connection unit number error in wireless remote controller system
  • 31 – Indoor unit power supply abnormal
  • 32 – Indoor unit main PCB error
  • 33 – Indoor unit fan motor 1 error
  • 35 – Indoor unit heat exchanger thermistor error
  • 39 – Indoor unit other thermistor error
  • 3A – Indoor unit temperature sensor error
  • 41 – Drainage error
  • 42 – Indoor unit float switch operated
  • 44 – Indoor unit serial communication error
  • 51 – Indoor unit fan motor error
  • 53 – Indoor unit heat exchanger sensor error
  • 57 – Indoor unit louver error
  • 59 – Indoor unit expansion valve error
  • 5U – Indoor unit other error
  • 61 – Indoor unit main PCB model information error
  • 62 – Indoor unit EEPROM access error
  • 63 – Indoor unit fan motor 2 error
  • 64 – Indoor unit fan motor 3 error
  • 65 – Pipe thermistor error
  • 68 – Outdoor unit fan motor error
  • 6A – Pipe temperature sensor error
  • 71 – Discharge temperature error
  • 72 – Compressor temperature error
  • 73 – Outdoor unit heat exchanger temperature error
  • 74 – Outdoor unit heat exchanger liquid temperature error
  • 75 – Outdoor temperature sensor error
  • 76 – Heat sink temperature error
  • 77 – Pressure sensor error
  • 82 – Outdoor unit EEPROM access error
  • 83 – Outdoor unit connection circuit error
  • 84 – Outdoor unit missing error
  • 86 – Outdoor unit model information error
  • 94 – Refrigerant leakage detected
  • 95 – High pressure switch operated
  • 97 – High pressure error
  • 98 – Low pressure error
  • 99 – Outdoor unit trip detected
  • 9A – Outdoor unit expansion valve error
  • A1 – Outdoor unit main PCB error
  • A3 – Outdoor unit inverter PCB error
  • A4 – Outdoor unit IPM error
  • A5 – Outdoor unit pressure error (low pressure)
  • AC – Outdoor unit trip detected (duplicate)
  • J2 – Branch boxes error

14.2 Outdoor unit error indications (display board LED patterns)

Each item below is provided on one line as required. Lamp text is copied in the same style (Blink counts and lamp patterns).

  • Serial communication error – Serial forward transmission error immediately after operation – LED display: Blink (2 times)● Blink (1 time) Blink (1 time) ○ ○ ● ●
  • Serial communication error – Serial forward transmission error during operation – LED display: Blink (2 times)● Blink (1 time) Blink (1 time) ○ ● ○ ○
  • Indoor unit capacity error – LED display: Blink (2 times)● Blink (2 times) Blink (2 times) ○ ○ ○ ●
  • Indoor unit error – LED display: Blink (2 times)● Blink (5 times) Blink (15 times) ○ ○ ○ ●
  • Outdoor unit main PCB error – Outdoor unit PCB model information error – LED display: Blink (2 times)● Blink (6 times) Blink (2 times) ○ ○ ○ ●
  • Inverter PCB error – Inverter error – LED display: Blink (2 times)● Blink (6 times) Blink (3 times) ○ ○ ○ ●
  • IPM error – Trip terminal L error – LED display: Blink (2 times)● Blink (6 times) Blink (5 times) ○ ○ ● ●
  • Discharge temp. sensor error – Discharge temp. sensor 1 error – LED display: Blink (2 times)● Blink (7 times) Blink (1 time) ○ ○ ○ ●
  • Compressor temp. sensor error – Compressor temp. sensor 1 error – LED display: Blink (2 times)● Blink (7 times) Blink (2 times) ○ ○ ● ○
  • Outdoor unit Heat Ex. center temp. sensor error – LED display: Blink (2 times)● Blink (7 times) Blink (3 times) ○ ○ ● ○
  • Outdoor unit Heat Ex. liquid temp. sensor error – LED display: Blink (2 times)● Blink (7 times) Blink (3 times) ○ ○ ● ●
  • Outdoor temp. sensor error – LED display: Blink (2 times)● Blink (7 times) Blink (4 times) ○ ○ ○ ●
  • Heat sink temp. sensor error – LED display: Blink (2 times)● Blink (7 times) Blink (7 times) ○ ○ ○ ●
  • Current sensor error – Current sensor 1 error (stoppage permanently) – LED display: Blink (2 times)● Blink (8 times) Blink (4 times) ○ ○ ○ ●
  • Pressure sensor error – High pressure switch 1 error – LED display: Blink (2 times)● Blink (8 times) Blink (6 times) ○ ● ○ ○
  • Pressure sensor error – LED display: Blink (2 times)● Blink (8 times) Blink (6 times) ○ ● ● ○
  • Trip detection – LED display: Blink (2 times)● Blink (9 times) Blink (4 times) ○ ○ ○ ●
  • Compressor motor control error – Rotor position detection error (stoppage permanently) – LED display: Blink (2 times)● Blink (9 times) Blink (5 times) ○ ○ ○ ●
  • Outdoor unit fan motor 1 error – Fan motor 1 error (stoppage permanently) – LED display: Blink (2 times)● Blink (9 times) Blink (7 times) ○ ○ ● ○
  • Outdoor unit fan motor 2 error – Fan motor 2 error (stoppage permanently) – LED display: Blink (2 times)● Blink (9 times) Blink (8 times) ○ ○ ● ○
  • 4-way valve error – LED display: Blink (2 times)● Blink (9 times) Blink (9 times) ○ ○ ○ ●
  • Discharge temp.1 error – LED display: Blink (2 times)● Blink (10 times) Blink (1 time) ○ ○ ○ ●
  • Compressor temp. error – Compressor 1 temp. error – LED display: Blink (2 times)● Blink (10 times) Blink (2 times) ○ ○ ○ ●
  • Pressure error 2 low pressure error – LED display: Blink (2 times)● Blink (10 times) Blink (5 times) ○ ○ ○ ●
  • IPM error – Temp. error – LED display: Blink (2 times)● Blink (6 times) Blink (5 times) ○ ○ ○ ●
  • Heat sink temp. error – LED display: Blink (2 times)● Blink (10 times) Blink (11 times) ○ ○ ● ●

15) UTY-RNRT specific error displays

The UTY-RNRYT5 wired remote controller displays error codes in the UTY-RNRT style. Use the code list below (one line per code):

  • 01 – Communication error between indoor unit and remote controller
  • 02 – Communication error between indoor unit and outdoor unit
  • 03 – Communication error between indoor unit and outdoor unit (duplicate display group)
  • 04 – Circuit board error
  • 05 – Circuit board error (duplicate display group)
  • 06 – Circuit board error (duplicate display group)
  • 07 – Circuit board error (duplicate display group)
  • 08 – Circuit board error (duplicate display group)
  • 09 – Power interruption error
  • 0A – Power interruption error (duplicate display group)
  • 0C – Other error (grouped)
  • 11 – Indoor unit fan motor 1 error
  • 12 – Indoor unit fan motor 1 error (duplicate display group)
  • 13 – Indoor unit fan motor 1 error (duplicate display group)
  • 14 – Indoor unit fan motor 2 error
  • 15 – Indoor unit fan motor 2 error (duplicate display group)
  • 16 – Indoor unit fan motor 2 error (duplicate display group)
  • 18 – Indoor unit fan motor 3 error
  • 19 – Indoor unit fan motor 3 error (duplicate display group)
  • 1A – Indoor unit fan motor 3 error (duplicate display group)
  • 1B – Indoor unit fan motor 4 error
  • 1C – Indoor unit fan motor 4 error (duplicate display group)
  • 1D – Indoor unit fan motor 4 error (duplicate display group)
  • 21 – Outdoor unit fan motor error
  • 22 – Outdoor unit fan motor error (duplicate display group)
  • 23 – Outdoor unit fan motor error (duplicate display group)
  • 24 – Outdoor unit fan motor error (duplicate display group)
  • 25 – Outdoor unit fan motor error (duplicate display group)
  • 27 – Outdoor unit fan motor error (duplicate display group)
  • 28 – Outdoor unit fan motor error (duplicate display group)
  • 2A – Outdoor unit fan motor error (duplicate display group)
  • 2B – Outdoor unit fan motor error (duplicate display group)
  • 2C – Outdoor unit fan motor error (duplicate display group)
  • 2D – Outdoor unit fan motor error (duplicate display group)
  • 2E – Outdoor unit fan motor error (duplicate display group)
  • 2F – Outdoor unit fan motor error (duplicate display group)
  • 31 – Outdoor unit primary circuit error
  • 32 – Outdoor unit primary circuit error (duplicate display group)
  • 33 – Outdoor unit primary circuit error (duplicate display group)
  • 34 – Outdoor unit primary circuit error (duplicate display group)
  • 35 – Outdoor unit primary circuit error (duplicate display group)
  • 38 – Outdoor unit primary circuit error (duplicate display group)
  • 3B – Outdoor unit primary circuit error (duplicate display group)
  • 3C – Outdoor unit primary circuit error (duplicate display group)
  • 3D – Outdoor unit primary circuit error (duplicate display group)
  • 3E – Outdoor unit primary circuit error (duplicate display group)
  • 3F – Outdoor unit primary circuit error (duplicate display group)
  • 41 – Discharge temperature error
  • 42 – Discharge temperature error (duplicate display group)
  • 43 – Discharge temperature error (duplicate display group)
  • 44 – Discharge temperature error (duplicate display group)
  • 45 – Discharge temperature error (duplicate display group)
  • 46 – Compressor temperature error
  • 47 – Compressor temperature error (duplicate display group)
  • 48 – Compressor temperature error (duplicate display group)
  • 49 – Compressor temperature error (duplicate display group)
  • 4A – Outdoor unit heat exchanger temperature error
  • 4B – Outdoor unit heat exchanger temperature error (duplicate display group)
  • 4C – Outdoor unit heat exchanger temperature error (duplicate display group)
  • 4D – Outdoor unit heat exchanger temperature error (duplicate display group)
  • 4E – Outdoor unit heat exchanger temperature error (duplicate display group)
  • 4F – Outdoor unit heat exchanger temperature error (duplicate display group)
  • 51 – Outdoor unit heat exchanger liquid temperature error
  • 52 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 53 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 54 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 55 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 56 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 58 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 59 – Outdoor unit heat exchanger liquid temperature error (duplicate display group)
  • 5A – Outdoor temperature sensor error
  • 5B – Outdoor temperature sensor error (duplicate display group)
  • 5C – Outdoor temperature sensor error (duplicate display group)
  • 5D – Outdoor temperature sensor error (duplicate display group)
  • 5E – Heat sink temperature error
  • 5F – Heat sink temperature error (duplicate display group)
  • 61 – Pressure sensor error
  • 62 – Pressure sensor error (duplicate display group)
  • 63 – Pressure sensor error (duplicate display group)
  • 64 – Pressure sensor error (duplicate display group)
  • 65 – Pressure sensor error (duplicate display group)
  • 66 – Pressure sensor error (duplicate display group)
  • 67 – Pressure sensor error (duplicate display group)
  • 68 – Pressure sensor error (duplicate display group)
  • 69 – Pressure sensor error (duplicate display group)
  • 6A – Pressure sensor error (duplicate display group)
  • 6B – Pressure sensor error (duplicate display group)
  • 6C – Pressure sensor error (duplicate display group)
  • 6D – Pressure sensor error (duplicate display group)
  • 6E – Pressure sensor error (duplicate display group)
  • 6F – Pressure sensor error (duplicate display group)
  • 71 – Outdoor unit trip detected
  • 72 – Outdoor unit trip detected (duplicate display group)
  • 73 – Outdoor unit trip detected (duplicate display group)
  • 74 – Outdoor unit trip detected (duplicate display group)
  • 75 – Outdoor unit trip detected (duplicate display group)
  • 76 – Outdoor unit trip detected (duplicate display group)
  • 77 – Outdoor unit trip detected (duplicate display group)
  • 78 – Outdoor unit trip detected (duplicate display group)
  • 79 – Outdoor unit trip detected (duplicate display group)
  • 7A – Outdoor unit trip detected (duplicate display group)
  • 7B – Outdoor unit trip detected (duplicate display group)
  • 7C – Outdoor unit trip detected (duplicate display group)
  • 7D – Outdoor unit trip detected (duplicate display group)
  • 7E – Outdoor unit trip detected (duplicate display group)
  • 7F – Outdoor unit trip detected (duplicate display group)
  • 81 – Indoor unit EEPROM access error
  • 82 – Indoor unit EEPROM access error (duplicate display group)
  • 83 – Indoor unit EEPROM access error (duplicate display group)
  • 84 – Indoor unit EEPROM access error (duplicate display group)
  • 85 – Indoor unit EEPROM access error (duplicate display group)
  • 86 – Indoor unit EEPROM access error (duplicate display group)
  • 87 – Indoor unit EEPROM access error (duplicate display group)
  • 88 – Indoor unit EEPROM access error (duplicate display group)
  • 89 – Indoor unit EEPROM access error (duplicate display group)
  • 8A – Indoor unit EEPROM access error (duplicate display group)
  • 8B – Indoor unit EEPROM access error (duplicate display group)
  • 8C – Indoor unit EEPROM access error (duplicate display group)
  • 8D – Indoor unit EEPROM access error (duplicate display group)
  • 8E – Indoor unit EEPROM access error (duplicate display group)
  • 8F – Indoor unit EEPROM access error (duplicate display group)
  • 94 – Outdoor unit EEPROM access error
  • 95 – Outdoor unit EEPROM access error (duplicate display group)
  • 96 – Outdoor unit EEPROM access error (duplicate display group)
  • 97 – Outdoor unit EEPROM access error (duplicate display group)
  • 98 – Outdoor unit EEPROM access error (duplicate display group)
  • 99 – Outdoor unit EEPROM access error (duplicate display group)
  • 9A – Outdoor unit EEPROM access error (duplicate display group)
  • 9B – Outdoor unit EEPROM access error (duplicate display group)
  • 9C – Outdoor unit EEPROM access error (duplicate display group)
  • 9D – Outdoor unit EEPROM access error (duplicate display group)
  • 9E – Outdoor unit EEPROM access error (duplicate display group)
  • 9F – Outdoor unit EEPROM access error (duplicate display group)