E:11 communication split flow - Three phase ARTG / AOTG LATT

3 wire remote controller communication check flow

E:64 PFC circuit error flow - Outdoor unit

E:65 trip terminal L / IPM error flow - Outdoor unit

E:94 trip detection / over current flow - Outdoor unit

E:95 compressor motor control 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 whether the installation is single indoor or simultaneous multi and confirm all indoor unit addresses/capacities.
4. Confirm safety: no burning smell, water ingress, damaged wiring, repeated breaker trips or refrigerant odour.
5. Confirm tools: multimeter with AC/DC volts, resistance and diode test.
6. 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 1-2, L1-N, L2-N and L3-N.
5. Reverse transfer signal: check outdoor terminal 2-3. Expected swing AC70-130 V.
6. Forward transfer signal: check outdoor terminal 2-3. Expected swing AC70-130 V.
7. If reverse transfer signal is abnormal, check outdoor fan motor 1/2 before outdoor main PCB approval.
8. If forward transfer signal is abnormal, replace indoor controller PCB and power 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: AR*G45/54LHTA CN6 1-3; ARTG45/54LHTB and ARTG60LHTA CN140 1-3; other models CN14 1-3. Manual service instruction calls for DC12 V at this connector.
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 from the service instruction: -10C 58.2 kΩ, -5C 44.0 kΩ, 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 4.3 kΩ.
4. ARTG45/54LHTB and ARTG60LHTA indoor thermistor connectors: H/E middle thermistor CN114, room temp thermistor CN110.
5. Outdoor thermistor faults require connector/cable check, thermistor resistance check, then PCB DC5.0 V check.
6. 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 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 and component training values; if motor is abnormal, replace fan motor.
4. For fan motor errors, if fan rotation, ambient and motor checks do not improve the symptom, replace the relevant power PCB/controller PCB as per model sequence.
5. Record fan rotation, motor reading, connector condition and PCB decision.

1. Power off. Rotate upper and lower outdoor 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. Outdoor fan speed reference: upper/lower fan speeds are displayed in outdoor present value mode from 0-900 rpm.
5. 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 50-480 pulses in cooling/dry and 40-480 pulses in heating. At compressor stop, EEV is set to 480 pulses. Initialization drives 528 pulses to 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 inverter/main 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 inverter/IPM, main PCB and then compressor.

1. Use this for E:63 inverter error, E:64 PFC circuit error, E:65 trip terminal L, E:77 heat sink thermistor, E:94 trip detection and E:95 compressor control error.
2. Confirm three phase supply readings are within range before board approval.
3. Inspect filter PCB, inverter PCB, PFC connectors and harnesses for loose connectors, corrosion, open cable or burn marks.
4. Check compressor winding and outdoor fan motor loading before recommending inverter/PFC/main PCB.
5. Attach photos and readings to ticket before board approval.

1. Check pressure sensor or high pressure switch connector and wiring condition.
2. Use outdoor present value mode to record low pressure range and high pressure range values where possible.
3. For A5, check valve position, outdoor ambient, outdoor fan, EEV/strainer, solenoid valve and refrigerant amount before sensor or PCB replacement.
4. Low pressure protection logic includes pressure sensor value 0.02 MPaG or less continuing for 5 minutes.

1. Check float switch operation and any blockage by dust.
2. Remove float switch and check ON/OFF switching operation by meter.
3. Check connector 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 unit number or refrigerant circuit address settings; addresses must be consecutive within the same refrigerant circuit.
2. Check total connected indoor capacity matches outdoor capacity within 3 minutes after power on.
3. Check indoor unit number connection; 4 or more indoor units in the same refrigerant system triggers connection number error.
4. Check primary/secondary setup. There must be one master unit in the same refrigerant system; avoid two masters and avoid address 0 set as slave.
5. Correct DIP switch or wiring, reset power and retest before PCB approval.

1. Reset power and confirm if E:32 returns.
2. Check all indoor electrical connectors for loose connector or incorrect wiring.
3. Check PCB for shortage, corrosion or water damage.
4. Check external cause such as poor earth or harmonic noise near the power cable.
5. If checks do not improve symptom, replace controller PCB.

1. Reset power and confirm if E:62 returns.
2. Check temporary voltage drop, momentary open circuit and grounding.
3. Check there are no related control cables routed near the power line causing noise.
4. If checks do not improve symptom, replace outdoor main PCB.

1. Check whether the manual auto switch is stuck or being held on for 60 seconds or more.
2. Check ON/OFF switching operation by meter.
3. If manual auto switch is disabled, replace it.
4. If switch testing does not improve symptom, replace controller PCB and indicator PCB as per manual.

1. Check connector is fitted, not miswired and no open cable.
2. Check relevant indoor thermistors are fitted in holders and not pinched or reading incorrectly.
3. Check solenoid coil / valve operation where accessible.
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, board control 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. If checks do not improve symptom, main PCB / current sensor board sequence becomes suspect.