Service manual

Troubleshooting

Diagnostic Procedure for Check Code

Check code Operation cause

1. Ps sensor error

2. Service valve closed

3. Indoor fan capacitor error

[bE] 4. Indoor/outdoor PMV blockage

Low-pressure protective operation 5. Indoor heat exchanger blockage

6. SV2 circuit

7. Incorrect wiring of communication cable between

indoor and outdoor units

Does the indoor fan operate?

Is there a blockage on the

indoor filter or heat exchanger?

Repair defective part.

Check indoor P.C. board.

If defective, replace.

Replace low-pressure sensor.

Clean or remove blockage.

Yes

Are the characteristics of

low-pressure sensor normal?

Yes

Insufficient refrigerant,

blockage, pipe breakage.

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

Set normal wiring.

Is the wiring correct?

Yes

Open valves fully.

Are the gas pipe and liquid

pipe service valves of the

outdoor unit fully open?

Are the following

items related to indoor

fan motor normal?

1. Connection

2. Capacitor

3. Motor

Yes

Modify SV2 bypass circuit.

Is SV2 bypass circuit normal?

Yes