Mitsubishi Heavy Industries SRK28HJ Technical Manual page 30

(2) Indication of Self Diagnosis (Indoor unit)
TIMER lamp
is lights
continuously.
RUN lamp is
lights
continuously.
(3) Troubleshooting
Abnormality of outdoor unit
Does compressor operate?
Yes
Is abnormality the same after
gas charging?
Yes
Clogging of capillary tube. etc.
Abnormality of indoor fan motor
RUN lamp is flashing.
(1 Time flash.)
RUN lamp is flashing.
(2 Time flash.)
RUN lamp is flashing.
(6 Time flash.)
TIMER lamp is flashing.
(5 Time flash.)
No
Insufficient gas.
No
Is the connector connection
good?
Yes
Is voltage being applied to the
fan motor?
Yes
The fan motor is defective.
28
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Connect of Defect
Abnormality of heat
¡ Disconnection of heat exchanger thermistor.
exchanger thermistor.
Abnormality of room ¡ Disconnection of room temperature
temperature thermistor.
thermistor.
¡ Fan motor is defective.
Abnormality of indoor
¡ Printed circuit board is defective.
fan motor.
¡ Compressor is defective.
Abnormality of outdoor
¡ Capacitor is defective.
unit.
¡ Gas is short.
[Compressor malfunction of insufficient gas (refrigerant)]
No
Is protective device normal?
Yes
No
Is capacitor normal?
Yes
Replace compressor.
(Fan motor defective, printed circuit board defective)
No
Repair the connector.
No
The indoor circuit board
is defective.
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Place of defect
Replace protective device.
Replace capacitor.