Inspection Procedures Corresponding To Detail Of Trouble - Mitsubishi Heavy Industries SRK10CNV Technical Manual

(6) Inspection procedures corresponding to detail of trouble

Sensor error
Is connector connection good?
YES
Is sensor resistance value good?
YES
Replace PCB.
◆ Discharge pipe sensor temperature characteristics
(Broken wire)
180
160
140
120
100
80
60
40
20
(Short circuit)
0
0 20
Indoor fan motor error
Is connector connection good?
YES
* Disconnect the fan motor
connector, then investigate
the DC fan motor and indoor
PCB separately.
Is the output of the indoor unit
PCB normal?
YES
Power supply reset
Is normal state restored?
YES
Malfunction by temporary
noise
NO
Correct connection.
NO
Replace sensor.
40 60 80 100 120
Temperature (˚C)
NO
Correct connector connection
Is DC fan motor resistance value good?
NO
Replace indoor PCB
Replace fan motor (If anomaly
NO
persiste after replacing fan motor,
replace indoor PCB)
◆ Sensor temperature characteristics
(Room temp., indoor heat exchanger temp.,
outdoor heat exchanger temp., outdoor air
temp.)
(Broken wire)
30
25
20
15
10
(Short circuit)
135
NO
YES
Replace indoor fan motor
Notes () See page  for the DC fan motor and indoor PCB check
procedure.
() After making sure the DC fan motor and indoor PCB are
normal, connect the connectors and confirm that the fan
motor is turning.
(If power is turned on while one or the other is broken down,
it could cause the other to break down also.)

- -
'14•SRK-T-153
[Broken sensor wire,
connector poor connection]
5
- 10
0 10 20 30 40
Temperature (˚C)
[Defective fan motor, connector poor
connection, defective indoor PCB]
50 60 70