Self-Diagnosis Table; Troubleshooting Procedure (If The Air-Conditioner Runs) - Mitsubishi Electric SRK05CR-S Technical Manual

(4) Troubleshooting procedure (If the air-conditioner runs)

Check the self-diagnosis display.
Identify the faulty component by using the check
procedure corresponding to the content of the trouble.
Replace the faulty component, then perform an
operation check.
Note () Even in cases where only intermittent stop data are generated, the air conditioning system is normal. However, if the same protective operation recurs
repeatedly ( or more times), it will lead to customer complaints. Judge the conditions in comparison with the contents of the complaints.

(5) Self-diagnosis table

When this air-conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of
display lights. If the air-conditioner is operated using the remote control  minutes or more after the emergency stop, the trouble
display stops and the air-conditioner resumes operation.
Indoor unit display section
Description
RUN TIMER
light light
1-time
Heat exchanger
ON
flash
sensor error
Room
2-time
ON
temperature
flash
sensor error
Indoor fan
6-time
ON
motor error
flash
2-time Trouble of
ON
outdoor unit
flash
Notes () The air-conditioner cannot be restarted using the remote control for  minutes after operation stops.
NO
YES
Confirm the contents of the customer complaint.
NO
The cause of the trouble can
be specifically identified.
See below.
NO
YES
Cause
of trouble
• Broken heat exchanger sensor
wire, poor connector
connection
• Indoor PCB is faulty
• Broken room temperature
sensor wire, poor connector
connection
• Indoor PCB is faulty
• Defective fan motor, poor
connector connection
• Broken compressor wire
• Compressor blockage
• 52C relay in indoor PCB is faulty
• Improper wire connection
between indoor and outdoor
YES
YES
Eliminate the cause of the trouble and perform an
operation check.
YES
YES
()
Display (flashing) condition
When a heat exchanger sensor wire disconnection is detected while operation is
stopped. (If a temperature of –28ºC or lower is detected for 15 seconds, it is
judged that the wire is disconnected.)
(Not displayed during operation.)
When a room temperature sensor wire disconnection is detected while operation
is stopped. (If a temperature of –45ºC or lower is detected for 15 seconds, it is
judged that the wire is disconnected.)
(Not displayed during operation.)
When conditions for turning the indoor unit's fan motor on exist during air-
conditioner operation, an indoor unit fan motor speed of 300 min
measured for 30 seconds or longer. (The air-conditioner stops.)
When there is an emergency stop caused by trouble in the outdoor unit, or the
input current value is found to be lower than the set value.
(The air-conditioner stops.)

- -
'15 • SRK-T-171
NO
YES
NO
NO
NO
or lower is
-1