ASTH30KMTD / ASTH34KMTD (Indoor) + AOTH30KMTD / AOTH34KMTD (Outdoor)

Coverage: ASTH30KMTD ASTH34KMTD AOTH30KMTD AOTH34KMTD

Important: Installation and servicing must be performed by experienced/authorised personnel. Do not energise the system until installation work is complete. If refrigerant leaks, ventilate the area. Ensure correct earthing/ELCB where required.
Contents

Safety and R32 notes

General installation warnings
  • Installation must follow the installation manual and applicable regulations. Improper installation can lead to injury, water leak, electric shock, or fire.
  • Do not turn on power until all work has been completed.
  • After servicing, check for refrigerant leakage before turning the unit on.
Source: Outdoor unit installation manual (Safety Precautions).
R32 specific notes
  • R32/R410A charging port thread is 1/2-20 UNF.
  • Use dedicated tools/materials suitable for R32/R410A pressures.
  • Prevent moisture/foreign matter entering the pipework.
Source: Outdoor unit installation manual (R32 precautions and tools).

Key specifications (outdoor unit)

These specifications are taken from the AOTH30KMTD / AOTH34KMTD outdoor unit manual.

Piping requirements

Pipe size reference (models covered by this article)
  • ASTH30KMTD: Standard pipe diameter (Liquid / Gas) is 9.52 mm (3/8") / 15.88 mm (5/8").
  • ASTH34KMTD: Standard pipe diameter (Liquid / Gas) is 9.52 mm (3/8") / 15.88 mm (5/8").
  • AOTH30KMTD: Standard pipe diameter (Liquid / Gas) is 9.52 mm (3/8") / 15.88 mm (5/8").
  • AOTH34KMTD: Standard pipe diameter (Liquid / Gas) is 9.52 mm (3/8") / 15.88 mm (5/8").
Source: Outdoor unit manual (pipe size/length/height difference and protection).
Maximum piping length (L)
  • KM series (applies to AOTH30KMTD and AOTH34KMTD): Maximum piping length is 50 m.
  • CN series: Maximum piping length is 50 m.
  • KN series: Maximum piping length is 30 m.
Source: Outdoor unit manual (pipe length limits).
Maximum height difference (H)
  • KM series (applies to AOTH30KMTD and AOTH34KMTD): Maximum height difference is 30 m.
  • CN series: Maximum height difference is 30 m.
  • KN series: Maximum height difference is 20 m.
Source: Outdoor unit manual (height difference limits).
Pipe protection during storage/installation

Protect pipes to prevent moisture/dust ingress (pinch or tape as indicated for duration/location).

Source: Outdoor unit manual (pipe protection guidance).

Electrical requirements

Power supply / frequency

ASTH30KMTD, ASTH34KMTD, AOTH30KMTD, AOTH34KMTD: 220–240 V ~ 50 Hz (operating range 198–264 V).

Source: Outdoor unit manual (electrical requirements).
Power supply cable

ASTH30KMTD, ASTH34KMTD, AOTH30KMTD, AOTH34KMTD: Minimum 2.5 mm², 2-core + ground (earth).

Source: Outdoor unit manual (electrical requirements).
Demand control signal transmission cable

ASTH30KMTD, ASTH34KMTD, AOTH30KMTD, AOTH34KMTD: 0.5–1.5 mm², double insulated, maximum length 30 m.

Source: Outdoor unit manual (electrical requirements).
Breaker capacity / Earth leakage breaker

ASTH30KMTD, ASTH34KMTD, AOTH30KMTD, AOTH34KMTD: 20 A / 30 mA.

Source: Outdoor unit manual (electrical requirements).
Isolation/disconnect device

Install a disconnect device with ≥3 mm contact gap in all poles near the units.

Source: Outdoor unit manual (electrical requirements).

Additional refrigerant charge (outdoor unit)

Pre-charge length (no additional charge required up to this length)
  • AOTH30KMTD: Pre-charge length is 20 m.
  • AOTH34KMTD: Pre-charge length is 25 m.
  • Reference note from manual: “30KM / 30KN / CN series: 20 m” and “34KM / 34KN: 25 m”.
Source: Outdoor unit manual (pre-charge lengths).
Additional charging guidance (when piping exceeds the pre-charge length)
  • 30KN model group: +200 g at 25 m; +400 g at 30 m (manual table lists “None” up to 20 m). Rate is 40 g/m.
  • 34KN model group: +200 g at 30 m (manual table lists “None” up to 25 m). Rate is 40 g/m.
  • 30KM / CN series model group: +200 g at 25 m; +400 g at 30 m; +800 g at 40 m; +1,200 g at 50 m (manual table lists “None” up to 20 m). Rate is 40 g/m.
  • 34KM model group: +200 g at 30 m; +600 g at 40 m; +1,000 g at 50 m (manual table lists “None” up to 25 m). Rate is 40 g/m.
Source: Outdoor unit manual (additional charge guidance and rate).

Operating temperature range (outdoor unit)

Outdoor temperature range
  • Cooling: -10°C to 50°C (note: “suction temperature of the outdoor unit”).
  • Dry: -10°C to 50°C.
  • Heating (reverse cycle): -15°C to 24°C.
Source: Outdoor unit manual (operable temperature conditions).

Pump down (outdoor unit)

The outdoor unit manual describes the pump down procedure using the display board LEDs and the PUMP DOWNbutton. After completion, the LED display indicates completion and the unit remains stopped until power is turned off.
Source: Outdoor unit manual (pump down notes and LED examples).

Error codes (combined)

Indoor unit error codes (ASTH30KMTD / ASTH34KMTD)

Where codes appear
  • Wireless remote: lamp on the photodetector unit outputs error codes via blinking pattern.
  • Wired remote (optional): error codes appear on the remote display.
Source: Indoor unit manual (error code overview).
How to check error memory (indoor unit)
  • Stop operation, disconnect and reconnect power.
  • During the “3 minutes ST” period (about 2 minutes 20 seconds after power on), display the memorised error using either:
    (a) start operation then press TEST RUN on the remote, or
    (b) press and hold MANUAL AUTO on the indoor unit for 10 seconds or more.
  • To erase error memory: press MANUAL AUTO while the error memory display is shown.
Source: Indoor unit manual (error memory check/erase).

Indoor unit error codes (one line per code)

Below is the combined error code list shown in the ASTH30KMTD / ASTH34KMTD manual tables (table contains some items noted as not relevant to every product). Display mode uses blink patterns and a 2-digit code.

  • Error code 11: Serial communication error.
  • Error code 12: Wired remote controller communication error.
  • Error code 15: Check run unfinished.
  • Error code 16: Peripheral unit transmission PCB connection error.
  • Error code 18: External communication error.
  • Error code 21: Unit number / refrigerant circuit address setting error (simultaneous multi-split type).
  • Error code 22: Indoor unit capacity error.
  • Error code 23: Combination error.
  • Error code 24: Connection unit number error (indoor secondary unit – simultaneous multi-split) / connection unit number error (indoor unit or branch unit – multi-split).
  • Error code 26: Indoor unit address setting error.
  • Error code 27: Primary/secondary unit setup error (simultaneous multi-split type).
  • Error code 29: Connection unit number error in wired remote controller system.
  • Error code 31: Power supply interruption error.
  • Error code 32: Indoor unit PCB model information error.
  • Error code 33: Indoor unit motor electricity consumption detection error.
  • Error code 35: Manual auto switch error.
  • Error code 39: Indoor unit power supply error for fan motor.
  • Error code 3A: Indoor unit communication circuit (wired remote controller) error.
  • Error code 41: Room temperature sensor error.
  • Error code 42: Indoor unit heat exchanger temperature sensor error.
  • Error code 51: Indoor unit fan motor error.
  • Error code 53: Drain pump error.
  • Error code 54: Electric air cleaner remote control error (VEDIA).
  • Error code 57: Filter error.
  • Error code 58: Indoor unit protection error.
  • Error code 59: Indoor unit fan motor 2 error.
  • Error code 5A: Indoor unit fan motor 3 error.
  • Error code 5B: Indoor unit sensor error.
  • Error code 61: Outdoor unit wiring error.
  • Error code 62: Outdoor unit PCB model information error.
  • Error code 63: Inverter compressor error.
  • Error code 64: Active filter error / PFC circuit error.
  • Error code 65: Trip terminal L error.
  • Error code 66: Compressor overcurrent error.
  • Error code 67: Damper error.
  • Error code 68: Outdoor unit heat exchanger temperature sensor error.
  • Error code 6A: Outdoor unit PCB model information error.
  • Error code 71: Discharge temperature sensor error.
  • Error code 72: Compressor temperature sensor error.
  • Error code 73: Outdoor unit heat exchanger liquid temperature sensor error.
  • Error code 74: Outdoor temperature sensor error.
  • Error code 75: Suction gas temperature sensor error.
  • Error code 76: 2-way / 3-way valve temperature sensor error.
  • Error code 77: Heat sink temperature sensor error.
  • Error code 82: Sub-cool heat exchanger gas inlet/outlet temperature sensor error.
  • Error code 83: Liquid pipe temperature sensor error.
  • Error code 84: Current sensor error.
  • Error code 86: Discharge pressure / suction pressure / high pressure switch error.
  • Error code 94: Trip detection.
  • Error code 95: Compressor rotor position detection error.
  • Error code 97: Outdoor unit fan motor error.
  • Error code 98: Outdoor unit fan motor 2 error.
  • Error code 99: 4-way valve error.
  • Error code 9A: Coil (expansion valve) error.
  • Error code A1: Discharge temperature error.
  • Error code A3: Compressor temperature error.
  • Error code A4: High pressure error.
  • Error code A5: Low pressure error.
  • Error code AC: Heat sink temperature error.
  • Error code J2: Branch boxes error (multi-split type).
Source: Indoor unit manual (error code table content).

Outdoor unit error codes (AOTH30KMTD / AOTH34KMTD — display board)

Error display mode
  • When an error occurs, the ERROR LED blinks.
  • To start checking the code: confirm ERROR LED is blinking, then press the ENTER button once.
Source: Outdoor unit manual (error display mode).

Outdoor unit error code check (one line per example)

The outdoor unit uses a combination of LED blink counts across indicators (POWER/MODE/ERROR/PUMP DOWN/LOW NOISE/PEAK CUT). Below are examples shown in the manual. Each example is presented on a single line for AI readability.

  • Serial communication error — Serial forward transmission error immediately after operation — LED display summary: POWER/MODE blink (2); ERROR on + blink (1); PUMP DOWN blink (1); others per manual table.
  • Serial communication error — Serial forward transmission error during operation — LED display summary: POWER/MODE blink (2); ERROR on + blink (1); PUMP DOWN blink (1); others per manual table.
  • Indoor unit capacity error — Indoor unit capacity error — LED display summary: POWER/MODE blink (2); ERROR on + blink (2); PUMP DOWN blink (2).
  • Indoor unit error — Indoor unit error — LED display summary: POWER/MODE blink (2); ERROR on + blink (5); PUMP DOWN blink (15).
  • Outdoor unit main PCB error — Outdoor unit PCB model information error — LED display summary: POWER/MODE blink (2); ERROR on + blink (6); PUMP DOWN blink (2).
  • Inverter PCB error — Inverter error — LED display summary: POWER/MODE blink (2); ERROR on + blink (6); PUMP DOWN blink (3).
  • IPM error — Trip terminal L error — LED display summary: POWER/MODE blink (2); ERROR on + blink (6); PUMP DOWN blink (5).
  • Discharge temperature sensor error — Discharge temperature sensor 1 error — LED display summary: POWER/MODE blink (2); ERROR on + blink (7); PUMP DOWN blink (1).
  • Outdoor temperature sensor error — Outdoor temperature sensor error — LED display summary: POWER/MODE blink (2); ERROR on + blink (7); PUMP DOWN blink (4).
  • Current sensor error — Current sensor 1 error (stoppage permanently) — LED display summary: POWER/MODE blink (2); ERROR on + blink (8); PUMP DOWN blink (4).
  • Pressure sensor error — High pressure switch 1 error — LED display summary: POWER/MODE blink (2); ERROR on + blink (8); PUMP DOWN blink (6).
  • Trip detection — Trip detection — LED display summary: POWER/MODE blink (2); ERROR on + blink (9); PUMP DOWN blink (4).
  • Compressor motor control error — Rotor position detection error (stoppage permanently) — LED display summary: POWER/MODE blink (2); ERROR on + blink (9); PUMP DOWN blink (5).
  • Outdoor unit fan motor 1 error — Fan motor 1 error (stoppage permanently) — LED display summary: POWER/MODE blink (2); ERROR on + blink (9); PUMP DOWN blink (7).
Source: Outdoor unit manual (error code check table and examples).
Tip for Freshdesk use: If preferred, split the “Error codes” section into two separate solution articles (Indoor vs Outdoor) and cross-link them. The internal anchor links in this HTML will also work when pasted into the Freshdesk Solution HTML editor.

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