Panasonic CU-4KS31NBU Trouble Diagnosis of Each Part, Problems of Each Part and Inspection Points

8-4. Trouble Diagnosis of Each Part

8-4-1. Problems of Each Part and Inspection Points

For details about the inspection points, refer to the Inspection Points for Each Part.

Indoor unit

Outdoor unit

Others

Problems

Operation lamp does not illuminate.

The compressor (only) does not operate.

The compressor stops on occasion.

The compressor speed does not increase.

The electric expansion valve does

Indoor unit does not operate.

Outdoor unit does not operate.

Outdoor fan dose not turn.

performance is inadequate.

No. of

Operation lamp blinking.

Indoor fan dose not turn.

Does not cool or cooling

Inspection

Points for

Each part

Inspection

not operate.

points

Self-Diagnostics check

Indoor controller

(control unit)

Indoor fan motor

unit

Room temperature

sensor

Indoor

Heat exchanger

temperature sensor

Inter-unit cable

Switch circuit board

Outdoor control circuit

(1)

board

Diode module

HIC

Electrolytic capacitor

Fuse

(2)

unit

Compressor

(3)

Outdoor

Compressor protective

(4)

sensor

Outdoor fan motor

Coil thermistor

(5)

Electric expansion valve

(6)

Branch tubing

(7)

temperature sensor

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