Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 121

(7) Inspection procedures corresponding to detail of trouble
Sensor error
Sensor temperature characteristics
(Room temperature, indoor heat exchanger temperature)
30
25
20
15
10
5
(Short-circuit)
- 10
0 10
Temperature (˚C)
Indoor fan motor error
the fan motor and indoor
unit PCB separately.
Is the output of the indoor unit
PCB normal?
Power source reset
Is it normalized?
Malfunction by temporary noise
20 30 40 50 60 70
Defective indoor unit PCB
Replace fan motor. (If the
error persists after replacing
the fan motor, replace the
indoor unit PCB.)
-
Replace indoor fan motor.
procedure.
After making sure the fan motor and indoor unit PCB are
normal, connect the connectors and confirm that the fan
motor is turning.
120
-
'09•SRK-DB-087D
'19 • PAC-SM-334
Broken sensor wire,
connector poor connection
Defective fan motor, connector poor
connection, defective indoor unit PCB
123 for the fan motor and indoor unit PCB check