E:11 communication split flow - ARTG54LHTC / AOTG54LCTL

3 wire remote controller communication check flow

E:63 inverter error flow - Outdoor unit

E:65 IPM error flow - Outdoor unit

E:94 over current error flow - Outdoor unit

E:95 compressor control error flow - Outdoor unit

E:A1 discharge temperature / E:A3 compressor temperature flow - Outdoor unit

E:A5 low pressure error flow - Outdoor unit

1. Confirm caller name, company, site address, indoor model/serial and outdoor model/serial.
2. Confirm exact complaint: error code, operating mode, when it occurs and whether it is repeatable.
3. Confirm safety: no burning smell, water ingress, damaged wiring, repeated breaker trips or refrigerant odour.
4. Confirm tools: multimeter with AC/DC volts, resistance and diode test.
5. Decision point: if caller is not qualified or cannot identify terminals safely, stop at non-invasive checks and arrange authorised attendance.

1. Reset power and confirm if E:11 returns.
2. Check external causes such as poor earth, noise or equipment causing harmonic wave near power cable.
3. Check interconnect and control unit connections for loose connector, open cable or mis-wiring.
4. Check outdoor supply: expected AC198-264 V at outdoor terminal L-N.
5. Reverse transfer signal: check outdoor terminal 1-3. Expected swing AC90-270 V.
6. Forward transfer signal: check outdoor terminal 2-3. Expected swing AC30-130 V.
7. If reverse transfer signal is abnormal, check outdoor fan motor, active filter module, transistor PCB/IPM and filter PCB CN110 before main PCB approval.
8. If forward transfer signal is abnormal, replace controller PCB after wiring, supply and external noise are proven.

1. At the rear of the wall controller, confirm Y1 = 12 V/red, Y2 = signal/white, Y3 = COM/black.
2. Measure Y1 to Y3: expected 12 VDC, no less than 11.4 VDC.
3. Manual PCB supply reference: CN140 terminal 1-3 is the power supply to remote control and should be approximately DC13 V.
4. Remove Y2 from the remote. Measure between remote terminal Y2 and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
5. Measure between the disconnected Y2 wire going to the indoor unit and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
6. If no 12 V supply, check indoor PCB remote power supply. If remote has supply but no Y2 pulse, suspect remote controller. If field Y2 has no return pulse, check cable and indoor controller PCB.

1. Isolate power. Check connector is not loose, removed, miswired or open.
2. Disconnect thermistor and measure resistance out of circuit. Compare to actual bulb temperature.
3. Indoor room thermistor rough values: 0C 33.6 kΩ, 5C 25.9 kΩ, 10C 20.2 kΩ, 15C 15.8 kΩ, 20C 12.5 kΩ, 25C 10.0 kΩ, 30C 8.0 kΩ, 35C 6.5 kΩ, 40C 5.3 kΩ, 45C 4.35 kΩ, 50C 3.59 kΩ.
4. Indoor heat exchanger thermistor rough values: 0C 176 kΩ, 5C 134 kΩ, 10C 103 kΩ, 15C 80.3 kΩ, 20C 62.9 kΩ, 25C 49.7 kΩ, 30C 39.6 kΩ, 35C 31.7 kΩ, 40C 25.6 kΩ, 45C 20.8 kΩ, 50C 17.1 kΩ.
5. Indoor connector references: Room thermistor CN110; H/E thermistor CN114.
6. Outdoor connector references: discharge CN62 1-2, compressor CN62 3-4, heat exchanger outlet CN63 1-2, outdoor temperature CN61 1-3. Check each for DC5.0 V after removing thermistor.
7. Replace thermistor only when resistance is open/short/out of table. Replace PCB only when connector/wiring and thermistor are proven.

1. Power off. Rotate fan motor 1 and fan motor 2 by hand and check for obstruction, bearing lock, dropped fan or casing contact.
2. Check ambient temperature around the motor and confirm no external heat source is affecting it.
3. Check indoor fan motor using Service Parts Information: if motor is abnormal, replace indoor fan motor.
4. Manual logic: if actual indoor fan frequency remains below one third of target frequency for more than 56 seconds, fan motor fault is detected.
5. If rotation, ambient and motor checks do not improve symptom, replace power supply PCB as manual sequence.
6. Record fan rotation, motor reading, connector condition and PCB decision.

1. Power off. Rotate upper and lower fan by hand and check obstruction, bearing lock, fan guard contact or damaged fan.
2. Check ambient temperature around the motor and confirm no external heat source is affecting it.
3. Check outdoor fan motor using circuit-test between Vm and GND. If short-circuited below 300 kΩ, replace outdoor fan motor and main PCB where required.
4. Manual live output reference at main PCB side connector: Red-Black 280-373 VDC and White-Black 15 VDC ±1.5 V.
5. Fan motor 1 is CN800. Fan motor 2 is CN802.
6. On E:11 reverse transfer faults, abnormal outdoor fan motor can load the signal path. Check both fan motors before outdoor PCB approval.

1. Check EEV connector for loose connector or open cable.
2. Remove connector and check EEV coil resistance. Common service training value: Yellow-Red, Orange-Red, Blue-Red, White-Red = 46 Ω ±4 Ω at 20C.
3. Remove connector and check PCB drive voltage: expected DC12 V.
4. Turn on power and listen/feel for EEV start-up operation noise.
5. Manual EEV pulse range is 53-480 pulses; power-on initialisation drives 528 pulses to the closing direction.
6. Check opening/closing effect by temperature difference. Closed valve creates inlet/outlet temperature difference; open valve has no temperature difference.
7. Check strainer. A temperature difference across the strainer suggests internal clogging.

1. Check compressor terminal connection and main PCB / transistor PCB connection for loose or incorrect wiring.
2. Check winding resistance between U-V, V-W and U-W and record all three values. Treat 0 Ω, infinity or imbalance as abnormal.
3. If compressor does not start or stops soon, also check gas pipe valve open, refrigerant leak, strainer clogging and harness condition before compressor approval.
4. If connection and winding resistance do not improve symptom, follow manual sequence for transistor PCB/IPM, main PCB and then compressor.

1. Use this for E:11 reverse transfer abnormal, E:63 inverter error, E:65 IPM error, E:77 heat sink thermistor, E:94 overcurrent and E:95 compressor control error.
2. Confirm L-N supply is within range before board approval.
3. Inspect filter PCB, active filter module, transistor PCB/IPM and main PCB connections for loose connectors, corrosion, open cable or burn marks.
4. For E:77, manual action is inverter PCB replacement because heat sink thermistor is built into IPM/inverter section.
5. Check compressor winding and outdoor fan motor loading before recommending inverter/transistor/main PCB.
6. Attach photos and readings to ticket before board approval.

1. Check pressure sensor or high pressure switch connector and wiring condition.
2. Pressure sensor PCB supply reference: Red to Black is DC5 V ±5%; White to Black output follows pressure graph.
3. For A5, check valve position, ambient, outdoor fan, indoor/outdoor EEV/strainer, SV1 and refrigerant amount before sensor or PCB replacement.
4. Use outdoor present value mode to record low pressure range and high pressure range values where possible.

1. Check float switch operation and any blockage by dust.
2. Remove float switch and check ON/OFF switching operation by meter.
3. Check CN120 and shorted / pinched wire.
4. Check drain hose for clogging, traps or poor fall.
5. If all checks are normal and drainage error remains, controller PCB becomes suspect.

1. Check connector is fitted, not miswired and no open cable.
2. Check indoor thermistors are fitted in holders and not pinched or reading incorrectly.
3. Remove CN6 and check solenoid coil resistance. Manual value is approximately 1.7 kΩ.
4. Check valve position by piping temperature difference. If valve position is not correct after coil and thermistors are proven, valve may be faulty.
5. If checks pass and error remains, main PCB becomes suspect.

1. Reset power and confirm if E:84 returns.
2. Check external causes: voltage drop, momentary open circuit, noise and grounding.
3. Check outdoor electrical component connectors, terminal tightness, miswiring and open cables.
4. Manual detection logic: current sensor detects 0 A while inverter compressor operates above 56 rps after 1 minute from compressor start, excluding defrost.
5. If checks do not improve symptom, main PCB becomes suspect.