Service manual

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

1. Outdoor unit service valve closed

[A7] 2. Blockage PMV assembly on the liquid line

TS condition gas leak detection 3. TS sensor error

4. Insufficient refrigerant, blockage in pipe

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 TS sensor.

Replace both the PMVs.

Yes

Are the resistance characteristics

of TS sensor normal?

Yes

Insufficient refrigerant,

blockage, pipe breakage.

Check code Operation cause

[AA]

Pd sensor output voltage alarm

Pd sensor alarm

If there is an abnormal output voltage of Pd sensor: Check connector circuit

(Pd sensor: CN501) and output voltage of the sensor.

If the sensor is normal, replace the outdoor interface P.C. board.