Service manual

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

1. Leakage of PMV assembly on the liquid line

[dd] 2. Pd sensor/Ps sensor error

Outdoor refrigerant leakage 3. Blockage in SV2 valve circuit

detection 4. Blockage in SV3B valve circuit

5. Blockage in capillary of bypass between gas pipe

and heat exchanger line

Is there a blockage

in the PMV assembly on

the liquid line?

Are the characteristics of

Pd sensor/Ps sensor output

voltage normal?

Replace both the PMVs.

Replace SV2 valve.

Pd sensor/Ps sensor error.

Yes

Is there a blockage in the

capillary between the gas pipe

and the heat exchanger

liquid line?

Replace capillary.

Yes

Is there a blockage

in SV2 valve circuit?

Yes

No blockage

Check interface P.C. board.

Replace blocked part.

Is there a blockage

in SV3B valve circuit?

Yes

No blockage

Check connection

(SV2: CN312)

Is SV2 valve coil normally

connected?

Yes