Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 263

(2) Indication of Self Diagnosis (Indoor unit)
TIMER lamp
is lights
continuously
Abnormality of thermistor
Is connection to connector
good?
Yes
Is thermistor resistance
value normal?
Yes
Replace PCB.
Abnormality of indoor fan motor
(3) Trouble Diagnostic Procedures
Indicator lamp of
indoor unit does not
illuminate.
RUN lamp is flashing.
(1 Time/8 sec.)
RUN lamp is flashing.
(2 Time/8 sec.)
RUN lamp is flashing.
(6 Time/8 sec.)
Chart for thermistor (Th
No
Repair connector.
No
Replace thermistor.
Is the connector connection
good?
Yes
Is voltage being applied to the
fan motor?
Yes
The fan motor is defective.
Check receptacle voltage.
Check if PCB fuse is blown.
Check varister.
No
Check transformer secondary
voltage.
CNC red – red·approx. 12V AC
Yes
Replace PCB.
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 ciricuit board is defective.
fan motor.
Disconnection of sensor and defective connection of connector
, ) temperature resistance characteristics
1 2
(Disconnection)
(kΩ)
(Short circuit)
(Fan motor defective, printed circuit board defective)
No
Repair the connector.
No
The indoor circuit board
is defective.
Replace fuse.
Replace varister.
Replace transformer.
SCM-C
Place of defect
Temperature (°C)
261