Panasonic cu-4ks24nbu Manuale Utente

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.

Problems

Inspection

points

Indoor unit

Indoor unit does not operate.

Self-Diagnostics check

Indoor controller
(control unit)

Indoor fan motor

Room temperature
sensor

Heat exchanger
temperature sensor

Inter-unit cable

Switch circuit board

Outdoor control circuit
board

Diode module

HIC

Electrolytic capacitor

Fuse

Compressor

Compressor protective
sensor

Outdoor fan motor

Coil thermistor

Electric expansion valve

Branch tubing
temperature sensor

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Operation lamp blinking.

Operation lamp does not illuminate.

Indoor fan dose not turn.

Outdoor unit does not operate.

Outdoor fan dose not turn.

The compressor (only) does not

operate.

The compressor stops on occasion.

The compressor speed does not

increase.

The electric expansion valve does

not operate.

Does not cool or cooling

performance is inadequate.

Outdoor unit

Others

No. of
Inspection
Points for
Each part

Indoor unit

Outdoor unit