Service manual

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

1. Outdoor unit service valve closed

2. Cooling bypass PMV error

[AE] 3. TD1 sensor error

TD1 condition gas leak detection 4. Insufficient refrigerant, blockage in pipe

5. Blockage of indoor filter

6. Blockage of PMV assembly on the liquid line

Are the gas pipe and liquid

pipe service valves of the

outdoor unit fully open?

Is there a blockage

in the PMV assembly on

the liquid line?

Open valves fully.

Replace TD1 sensor.

Replace both the PMVs.

Yes

Are the resistance characteristics

of TD1 sensor normal?

Yes

Insufficient refrigerant,

blockage, pipe breakage.

(Check miswiring of the outdoor unit according to miswiring check function.)

Check code Operation cause

[AF] Abnormal power phase order or missing phase of

Phase order alarm power supply to the outdoor unit

There is an abnormal power phase order or missing phase of power supply to the outdoor

unit. Check power supply wiring.

Set normal wiring.

Is the wiring correct?

Yes

Cooling bypass PMV B error

Is the cooling bypass

PMV B normal?

Yes