Mitsubishi Electric CMB-PW202V-J Service Handbook page 105

[ VIII Troubleshooting ]
Check whether the BC board output signal corresponds with the solenoid valve operation correspond.
1) SVM1
SVM1 turns on or off according to the operation mode.
Operation
Cooling only
mode
SVM1 ON
2) 21S4a operation control
21S4a turns on or off according to the operation mode.
Operation
Cooling only
mode
21S4a
3. WCB transformer
CNTR(1)-(3)
CN03(1)-(3)
* Before measuring the resistance, pull out the connector.
HWE09070
Cooling main
Differential
temperature
control OFF or
ON
Cooling main
OFF OFF
CNTR
Red
about 58 ohm.
about 1.6 ohm.
Heating only Heating main
OFF OFF
Heating only Heating main
ON OFF
WCB control board
CN03
White Red Red
Normal
Open-phase or shorting
- 96 -
Defrost Stopped
ON OFF
Defrost
The status be-
fore defrosting
maintained
Abnormal
Stopped
OFF
GB