• Isolate power before servicing. After turning the power supply off, wait at least 5 minutes before touching electrical components.
• Do not use open flame and eliminate ignition sources during service work.
• Ventilate the work area before and during service, particularly if a refrigerant leak is suspected.
• Leak checking: use an appropriate leak detector when refrigerant leakage is possible.
• Do not mix refrigerants. Use only the specified refrigerant type for this system.

Note: Always follow local electrical and refrigeration safety requirements, and site-specific risk controls.

• Work area controls: keep ignition sources away; ensure airflow/ventilation; do not energise the system if safe leak checks are not complete.
• Leak response: stop work, ventilate, locate leak with appropriate detector, repair, and re-test before charging/energising.
• Charging discipline: use an electronic scale; charge by weight; avoid overcharge.

• R32/A2L-rated manifold gauge set and hoses (low-loss fittings preferred).
• Vacuum pump suitable for refrigeration work (clean oil; non-return/check valve recommended).
• Accurate electronic weighing scale for refrigerant charging (grams resolution preferred).
• Dry nitrogen cylinder + regulator for pressure testing and line purging (do not use oxygen).
• Electronic leak detector suitable for A2L refrigerants (R32).
• Flaring tool and torque wrench for flares; deburrer; pipe cutter.
• Insulation, UV-rated cable ties, sealing putty, and weatherproofing materials.
• Digital multimeter (voltage, resistance), clamp meter, and insulation resistance tester (where required by your electrical practice).

• System type: split system with indoor unit ASTH24KMTE and outdoor unit AOTH24KMTE.
• Power architecture (typical): outdoor unit supplied by mains; indoor unit powered/controlled via the interconnect wiring (site wiring must follow the specific unit wiring diagram and local code).
• Control: wireless remote controller and/or wired remote controller (where fitted).

1. Install indoor/outdoor units; complete interconnect wiring; confirm polarity/earth.
2. Complete refrigerant piping; leak-test/pressure test; evacuate; confirm vacuum integrity.
3. Open service valves fully; confirm no leaks.
4. Power on; confirm no error codes; set required indoor function settings.
5. Run test operation; verify temperatures, pressures (where applicable), current draw, and stable operation.
6. Handover: explain operation, filters, maintenance, and what to do if error indications occur.

• Applicable models: ASTH24KMTE (indoor) + AOTH24KMTE (outdoor)
• Liquid pipe size: 6.35 mm (flare)
• Gas pipe size: 12.70 mm (flare)
• Pre-charged piping length: 15 m
• Maximum piping length: 30 m
• Maximum height difference: 25 m

• Keep piping runs as short as possible; avoid kinks/flattening.
• Use clean, dry copper tube; cap ends while routing to prevent moisture/contamination.
• Insulate gas line fully; insulate liquid line as required by your installation standard and ambient conditions.

• Outdoor unit power source: 220–240 V ~ 50 Hz
• Allowable voltage range: 198–264 V
• Starting current (reference): 9.8 A

• Earth continuity verified; correct polarity; no exposed conductors.
• Interconnect terminals tight; no conductor strands bridging terminals.
• Indoor/outdoor control wiring routed away from sharp edges and secured.

• Install on a stable, level base with vibration isolation as required.
• Maintain clearances per the outdoor unit installation space requirement for airflow and service access.
• Ensure condensate/drainage management does not create slip hazards or damage.
• Route refrigerant pipes and wiring with weatherproofing and UV protection.

• Confirm the mounting surface can support the indoor unit weight and vibration.
• Ensure condensate drain line has correct fall and is secured to prevent leaks.
• Seal wall penetrations to prevent water ingress, pests, and drafts.
• Confirm the indoor unit is level to prevent condensate overflow.

• Air tightness test and vacuuming must be performed firmly before the power supply is turned on.

1. Pressure test with dry nitrogen (use a safe pressure appropriate for the equipment and local practice).
2. Leak check all joints with leak detector and approved leak-check method.
3. Evacuate with a vacuum pump to a deep vacuum; isolate and confirm vacuum holds.
4. Open service valves fully; re-check for leaks.
5. Run commissioning/test operation; verify stable operation and no error codes.

• Refrigerant type: R32
• Base charge (factory): 1270 g
• Factory charge covers piping length: 15 m
• Maximum piping length: 30 m

• If total piping length ≤ 15 m: Additional charge = 0 g
• If total piping length > 15 m: Additional charge = (total length − 15 m) × (additional charge factor in g/m)

• Charge by weight using a calibrated scale.
• Record the final charge amount on job documentation for traceability.

1. Press and hold FAN and TEMP (▲) together for > 5 seconds to enter Function Setting mode.
2. Use TEMP (▲/▼) to select the function number (use 10°C HEAT to switch between left/right digits).
3. Press POWERFUL to move to setting value selection; press TEMP (▲/▼) to select value; press POWERFUL again to confirm.
4. Press START/STOP to exit.

• 00: Standard (400 hours) (factory setting)
• 01: Long interval (1,000 hours)
• 02: Short interval (200 hours)
• 03: No indication

• 00: Standard setting (factory setting)
• 01: No correction 0.0°C
• 02: −0.5°C
• 03: −1.0°C
• 04: −1.5°C
• 05: −2.0°C
• 06: −2.5°C
• 07: −3.0°C
• 08: −3.5°C
• 09: −4.0°C
• 10: +0.5°C
• 11: +1.0°C
• 12: +1.5°C
• 13: +2.0°C
• 14: +2.5°C
• 15: +3.0°C
• 16: +3.5°C
• 17: +4.0°C

• 00: Standard setting (factory setting)
• 01: No correction 0.0°C
• 02: −0.5°C
• 03: −1.0°C
• 04: −1.5°C
• 05: −2.0°C
• 06: −2.5°C
• 07: −3.0°C
• 08: −3.5°C
• 09: −4.0°C
• 10: +0.5°C
• 11: +1.0°C
• 12: +1.5°C
• 13: +2.0°C
• 14: +2.5°C
• 15: +3.0°C
• 16: +3.5°C
• 17: +4.0°C

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

• 00: Indoor unit sensor active (factory setting)
• 01: Both indoor unit and wired remote controller sensors active

• 00: A (factory setting)
• 01: B
• 02: C
• 03: D

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

• 00: Both (factory setting)
• 01: Wired remote controller only

• 00: Disable
• 01: Enable
• 02: Remote controller selects enable/disable (factory setting)

• 00: Operation status (factory setting)
• 01–08: Setting prohibited
• 09: Error status
• 10: Indoor unit fan operation status
• 11: Setting prohibited

• Use custom codes when multiple systems are installed in the same room and you need to prevent cross-control.
• Remote controller custom code and indoor unit function setting must match; otherwise the remote controller will not operate the unit.

• Confirm pressure test + evacuation completed and service valves are fully open.
• Confirm correct supply voltage and no error indication on start-up.
• Confirm filters are installed and airflow is unobstructed.

• Run cooling and heating (where ambient allows) long enough to confirm stable operation.
• Verify indoor fan speeds, louvre operation (if applicable), and correct response to controller inputs.
• Confirm condensate drainage is clear with no leakage.

• Explain controller operation, cleaning filters, and recommended maintenance intervals.
• Explain that error indications should be reported with the exact error code (E:xx / E:A1 etc.).

• Press FORCED COOLING OPERATION button for more than 10 seconds. The operation indicator lamp and timer indicator lamp blink simultaneously during forced cooling operation.
• Forced cooling operation ends after approximately 15 minutes.

• Operation mode: Cooling operation
• Fan speed: High
• Set temperature: 24°C

1. Confirm indoor/outdoor valves and access are safe; connect gauges using low-loss fittings.
2. Run forced cooling operation.
3. Close the liquid service valve first to drive refrigerant to the outdoor unit (monitor suction pressure).
4. Close the gas service valve at the appropriate point per your procedure to avoid vacuuming the compressor.
5. Stop the system and isolate power; tag the unit as pumped down.

• E: 11 | Serial communication error (Serial forward transfer error) (Indoor unit) | Indicators: Operation indicator: 1 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, or the indoor unit cannot receive the serial signal more | Likely causes: Connection failure; External cause; Main PCB failure; Indoor unit fan motor failure | Key checks: Reset the power and operate; Check connection; Check the voltage of power supply
• E: 11 | Serial communication error (Serial reverse transfer error) (Outdoor unit) | Indicators: Operation indicator: 1 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, or the indoor unit cannot receive the serial signal more | Likely causes: Connection failure; External cause; Main PCB failure; Outdoor unit fan motor failure | Key checks: Reset the power and operate; Check connection; Check the voltage of power supply
• E: 12 | Wired remote controller communication error (Indoor unit) | Indicators: Operation indicator: 1 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Upon receiving the signal more than 1 time from wired remote or other Indoor unit, but the same signal has not been received more than 2.5 minutes. | Likely causes: Terminal connection abnormal; Wired remote control failure; Main PCB failure | Key checks: Check the connection of terminal
• E: 18 | External communication error (Indoor unit) | Indicators: Operation indicator: 1 time flash; Timer indicator: 8 time flash; Economy indicator: Continuous flash | Trigger/logic: External communication error | Likely causes: Connection failure; External input and output PCB failure; Main PCB | Key checks: Check the connection; Replace the external input and output PCB; Replace the main PCB
• E: 22 | Indoor unit capacity error (Indoor unit) | Indicators: Operation indicator: 2 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the total capacity of the indoor units does not match outdoor unit capacity while 3 minutes after power | Likely causes: Indoor unit selection is incorrect.; Main PCB failure | Key checks: Check the total capacity of indoor units; Replace the main PCB
• E: 23 | Combination error (Outdoor unit) | Indicators: Operation indicator: 2 time flash; Timer indicator: 3 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When the indoor unit type does not match to outdoor unit type 3 minutes after power on | Likely causes: Incorrect combination; Main PCB failure | Key checks: Check the combination; Replace the main PCB
• E: 26 | Address setting error in wired remote controller (Indoor unit) | Indicators: Operation indicator: 2 time flash; Timer indicator: 6 time flash; Economy indicator: Continuous flash | Trigger/logic: Wired remote controller When there are 2 or more wired remote controllers connected on 1 indoor unit, and the address setting | Likely causes: Address setting of wired remote controller | Key checks: Make sure the address setting of wired remote controller
• E: 29 | Connected unit number error (Indoor unit) | Indicators: Operation indicator: 2 time flash; Timer indicator: 9 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When there is 2 indoor units connected with 1 outdoor unit, and the operation is started in any indoor u | Likely causes: The indoor unit is added after power on.; Indoor unit connection is incorrect. | Key checks: Reset the power and operate; Check the indoor unit connection
• E: 32 | Indoor unit main PCB error (Indoor unit) | Indicators: Operation indicator: 3 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the unit has detected the indoor unit EEPROM access error | Likely causes: Main PCB failure | Key checks: Replace main PCB
• E: 33 | Indoor unit motor electricity consumption detection error (Indoor unit) | Indicators: Operation indicator: 3 time flash; Timer indicator: 3 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the fan motor can not operate due to motor electricity consumption detection error | Likely causes: Indoor unit fan motor failure; Main PCB failure | Key checks: Replace fan motor; Replace main PCB
• E: 35 | MANUAL AUTO button error (Indoor unit) | Indicators: Operation indicator: 3 time flash; Timer indicator: 5 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the MANUAL AUTO button has been pressed continuously for 30 seconds or more | Likely causes: MANUAL AUTO button failure; Main PCB failure | Key checks: Check the MANUAL AUTO button; Replace main PCB
• E: 39 | Indoor unit power supply error for fan motor (Indoor unit) | Indicators: Operation indicator: 3 time flash; Timer indicator: 9 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the power supply output for fan motor is abnormal | Likely causes: Fan motor failure; Main PCB failure | Key checks: Replace fan motor; Replace main PCB
• E: 3A | Indoor unit communication circuit (wired remote controller) error | Indicators: Operation indicator: 3 time flash; Timer indicator: 10 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the communication circuit for wired remote controller is abnormal | Likely causes: Main PCB failure; Wired remote controller failure | Key checks: Replace wired remote controller; Replace main PCB
• E: 41 | Room temperature sensor error (Indoor unit) | Indicators: Operation indicator: 4 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: Room temp. thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 42 | Indoor unit heat exchanger sensor error (Indoor unit) | Indicators: Operation indicator: 4 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor heat exchanger temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 44 | Human sensor error | Indicators: Operation indicator: 4 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit main PCB When the Human sensor has detected abnormality | Likely causes: Human sensor failure; Main PCB failure | Key checks: Replace Human sensor; Replace main PCB
• E: 51 | Indoor unit fan motor error (Indoor unit) | Indicators: Operation indicator: 5 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: Indoor unit fan motor When the fan motor does not rotate properly | Likely causes: Fan motor failure; Main PCB failure; Connection failure | Key checks: Check the connection; Replace fan motor; Replace main PCB
• E: 62 | Outdoor unit main PCB error (Outdoor unit) | Indicators: Operation indicator: 6 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When outdoor unit EEPROM access error is detected | Likely causes: Main PCB failure | Key checks: Replace main PCB
• E: 63 | Inverter error (Outdoor unit) | Indicators: Operation indicator: 6 time flash; Timer indicator: 3 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When inverter PCB detects abnormality | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 64 | PFC circuit error (Outdoor unit) | Indicators: Operation indicator: 6 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When PFC circuit detects abnormality | Likely causes: Inverter PCB failure | Key checks: Replace inverter PCB
• E: 65 | IPM error (Outdoor unit) | Indicators: Operation indicator: 6 time flash; Timer indicator: 5 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When IPM detects abnormality | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 65 | Trip terminal L error (Outdoor unit) | Indicators: Operation indicator: 6 time flash; Timer indicator: 5 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When trip terminal L detects abnormality | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 71 | Discharge thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: Discharge temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 72 | Compressor thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 2 time flash; Economy indicator: Continuous flash | Trigger/logic: Compressor temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 73 | Outdoor unit heat exchanger thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 3 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor heat exchanger out temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 74 | Outdoor temperature thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 75 | Outdoor unit heat exchanger thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 5 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor heat exchanger in temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 76 | Liquid thermistor error (Outdoor unit) | Indicators: Operation indicator: 7 time flash; Timer indicator: 6 time flash; Economy indicator: Continuous flash | Trigger/logic: Liquid temperature thermistor When the thermistor is shorted or open circuit | Likely causes: Thermistor failure; Main PCB failure | Key checks: Check thermistor resistance; Replace thermistor; Replace main PCB
• E: 84 | Current sensor error (Outdoor unit) | Indicators: Operation indicator: 8 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When the current sensor output is abnormal | Likely causes: Inverter PCB failure; Current sensor failure | Key checks: Replace inverter PCB; Replace current sensor
• E: 86 | High pressure switch error (Outdoor unit) | Indicators: Operation indicator: 8 time flash; Timer indicator: 6 time flash; Economy indicator: Continuous flash | Trigger/logic: Pressure switch When the high pressure switch detects abnormality | Likely causes: High pressure switch failure; Refrigerant system abnormality | Key checks: Check high pressure switch; Check refrigerant circuit
• E: 88 | 4-way valve switching error (Outdoor unit) | Indicators: Operation indicator: 8 time flash; Timer indicator: 8 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When the 4-way valve does not switch properly | Likely causes: 4-way valve coil failure; Main PCB failure | Key checks: Check 4-way valve coil; Replace main PCB
• E: 8C | 3-way valve switching error (Outdoor unit) | Indicators: Operation indicator: 8 time flash; Timer indicator: 12 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When the 3-way valve does not switch properly | Likely causes: 3-way valve coil failure; Main PCB failure | Key checks: Check 3-way valve coil; Replace main PCB
• E: 91 | Outdoor unit temperature error (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When the outdoor unit temperature is abnormal | Likely causes: Outdoor unit heat exchanger clogging; Fan motor failure; Refrigerant system abnormality | Key checks: Check outdoor airflow; Check fan motor; Check refrigerant circuit
• E: 94 | Over current error (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When over current is detected | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 94 | Trip detection (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 4 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When trip detection occurs | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 95 | Compressor motor control error (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 5 time flash; Economy indicator: Continuous flash | Trigger/logic: Inverter PCB When compressor motor control error is detected | Likely causes: Inverter PCB failure; Compressor failure | Key checks: Replace inverter PCB; Replace compressor
• E: 96 | Outdoor unit communication error (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 6 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit main PCB When communication between inverter PCB and main PCB is abnormal | Likely causes: Connection failure; Inverter PCB failure; Main PCB failure | Key checks: Check connection between PCBs; Replace inverter PCB; Replace main PCB
• E: 97 | Outdoor unit fan motor error (Outdoor unit) | Indicators: Operation indicator: 9 time flash; Timer indicator: 7 time flash; Economy indicator: Continuous flash | Trigger/logic: Outdoor unit fan motor When the outdoor fan motor does not rotate properly | Likely causes: Fan motor failure; Main PCB failure; Connection failure | Key checks: Check connection; Replace fan motor; Replace main PCB
• E: A1 | Discharge temperature error (Outdoor unit) | Indicators: Operation indicator: 10 time flash; Timer indicator: 1 time flash; Economy indicator: Continuous flash | Trigger/logic: Protection stop by discharge temp ≥ 110°C during compressor operation; generated 2 times within 24 hours | Likely causes: The 3-way valve is not opened fully; Electronic expansion valve or capillary tube or strainer is clogged; Outdoor fan motor failure; Outdoor unit heat exchanger is clogged; Discharge temp thermistor failure; Insufficient refrigerant; Main PCB failure | Key checks: Check service valves; Check refrigerant circuit restriction; Check fan/coil cleanliness; Check thermistor; Check charge; Replace main PCB
• E: A3 | Compressor temperature error (Outdoor unit) | Indicators: Operation indicator: 10 time flash; Timer indicator: 3 time flash; Economy indicator: Continuous flash | Trigger/logic: Protection stop by compressor temperature ≥ 110°C during compressor operation; generated 2 times within 24 hours | Likely causes: The 3-way valve is not opened fully; Electronic expansion valve or capillary tube or strainer is clogged; Outdoor fan motor failure; Outdoor unit heat exchanger is clogged; Compressor temp thermistor failure; Insufficient refrigerant; Main PCB failure | Key checks: Check service valves; Check refrigerant circuit restriction; Check fan/coil cleanliness; Check thermistor; Check charge; Replace main PCB

• Thermistors are NTC type. Check for open circuit, short circuit, and correct resistance vs temperature trend.
• Reference points from thermistor charts (resistance in kilo-ohms):
• Discharge temperature thermistor: 0°C ≈ 168.60 kΩ; 25°C ≈ 49.84 kΩ; 50°C ≈ 17.79 kΩ
• Compressor temperature thermistor: 0°C ≈ 168.60 kΩ; 25°C ≈ 49.84 kΩ; 50°C ≈ 17.79 kΩ
• Outdoor temperature thermistor: 0°C ≈ 33.34 kΩ; 25°C ≈ 10.00 kΩ; 50°C ≈ 3.60 kΩ

• Inspect terminals and interconnect wiring for polarity, tightness, and continuity.
• Reset power after correcting wiring; confirm error clears and stable operation.
• If wiring is correct and error persists: isolate whether controller, indoor PCB, or outdoor PCB is failing (swap-test where permitted by your procedure).

• Check for physical obstruction, blade damage, and bearing seizure.
• Confirm correct supply to motor from the PCB and secure connector seating.
• Replace the fan motor if the motor does not rotate correctly with confirmed supply and command.

• Confirm airflow through outdoor coil and fan operation.
• Check refrigerant circuit for overcharge, restriction, or non-condensables (use proper recovery/recharge practices).
• Test switch continuity/operation according to your service practice.

• Confirm supply voltage within range and stable; check for loose mains connections.
• Inspect for burnt components/odour on inverter PCB; check compressor for winding issues and insulation faults.
• Replace inverter PCB and/or compressor as indicated by the troubleshooting path and verified test results.