E:11 communication split flow

3 wire remote controller communication check flow

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

E:95 compressor motor 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 L-N supply: expected AC198-264 V.
5. Reverse transfer signal: check outdoor terminal 1-3. Expected swing AC70-130 V.
6. Forward transfer signal: check outdoor terminal 2-3. Expected swing AC70-130 V.
7. If reverse signal is abnormal, check outdoor fan motor, active filter module, IPM/transistor PCB and filter PCB before outdoor PCB approval.
8. If forward signal is abnormal, suspect indoor controller PCB after wiring is 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. Manual indoor PCB remote supply reference is DC13 V at CN14 on ARTG30/36 or CN140 on ARTG45/54 terminals 1-3.
3. Remove Y2 from the remote. Measure between remote terminal Y2 and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
4. Measure between the disconnected Y2 wire going to the indoor unit and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
5. 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. Outdoor thermistors use Service Parts Information thermistor A/B/C/D table. Record measured temperature and kΩ.
6. With thermistor removed, check PCB supply: expected DC5.0 V at thermistor connector pins listed in the manual.

1. Power off. Rotate fan by hand and check for obstruction, bearing lock, dropped fan or casing contact.
2. Check high temperature around motor from external heat sources.
3. Check indoor fan motor using circuit-test between Vm and GND. If short-circuited below 300 kΩ, replace indoor fan motor and controller PCB.
4. Indoor fan motor pin functions: Blue feedback FG, Yellow speed command Vsp, White control voltage Vcc, Black GND, Red DC voltage Vm.
5. If motor checks OK and fault remains, power supply PCB is suspect.

1. Power off. Rotate fan by hand and check obstruction, bearing lock, fan guard contact or damaged fan.
2. Check ambient around motor and heat exchanger airflow.
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.
4. Live output reference at PCB side connector: Red-Black 240-400 VDC; White-Black 15 VDC ±1.5 V.
5. Outdoor fan motor pin functions: Red DC voltage Vm, Black GND, White Vcc, Yellow Vsp, Brown feedback FG.

1. Check EEV connector for loose connector or open cable.
2. Remove connector and check EEV coil resistance: 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. Check opening/closing effect by temperature difference. Closed valve creates inlet/outlet temperature difference; open valve has no temperature difference.
6. Check strainer. A temperature difference across the strainer suggests internal clogging.

1. Check compressor terminal connection for loose or incorrect wiring.
2. Check winding resistance between U-V, V-W and U-W. ARTG manual value: 0.432 Ω ±8% at 20C.
3. Insulation test from any winding to earth must be greater than 1 MΩ.
4. If resistance is 0 or infinite, replace compressor.
5. If compressor does not start or stops soon, also check gas pipe valve open, refrigerant leak, strainer clogging and harness condition before compressor approval.

1. Isolate supply and discharge capacitors before testing.
2. Disconnect wiring between transistor PCB, capacitor PCB and inverter compressor.
3. Resistance check: TM301 P to U/V/W and TM302 N to U/V/W should not be shorted. Manual references over 2 kΩ or over 20 kΩ depending polarity path.
4. Diode test: P/U/V/W/N paths should show approximately 0.3-0.7 V in the correct direction and open/OL in the reverse direction.
5. Record every diode path result before recommending transistor PCB/IPM.

1. Use this for inverter error, no outdoor signal follow-on and outdoor no power checks where active filter/IPM may load the circuit.
2. Check open/short and diode across active filter module terminals as per service parts table.
3. Check DC output voltage between P and N while compressor is stopped and operating.
4. If operating output voltage is less than stopped output voltage, active filter module is defective.

1. High pressure switch: check connector and wiring open. Switch characteristics: contact short/open around 4.2 ±0.1 MPa and returns around 3.2 ±0.15 MPa.
2. Discharge pressure sensor: with connector connected, measure Main PCB CN91:3-4 DC and compare output voltage to pressure.
3. Suction pressure sensor: with connector connected, measure Main PCB CN92:2-3 DC and compare output voltage to pressure.
4. Record actual pressure, voltage and connector condition before PCB recommendation.

1. Check float switch operation and any blockage by dust.
2. Remove float switch and check ON/OFF switching with meter.
3. Check connector CN000 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 CN111 and check solenoid coil resistance: approximately 1.4 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 current sensor error 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 is suspect.

1. Check indoor fan runs on high fan, filter is clean and indoor heat exchanger is not blocked.
2. Check outdoor unit operation, air route obstruction and heat exchanger condition.
3. Check valve position and whether indoor capacity suits room size and site load.
4. Check pipe length/diameter, interconnect wiring and communication line.
5. Check strainer, EEV, compressor, gas pressure and leak condition. Recharge by evacuation and weighed charge only.