Mitsubishi Electric MUZ-GE25VA, Service Manual

Page: 57 / 70

57
O Check of defrost heater
Check the following points before checking electric continuity.
1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1.
2. Is the resistance of defrost heater normal? Refer to 11-4.
3. Does the heater protector remain conducted (not open)?
4. Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?
Is there 230 VAC between CN722 and on
the inverter P.C. board? Refer to 11-6.1.
Not the problem of the inverter P.C. board.
Replace the inverter P.C. board.
No
Yes
In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5°C or
below, and let the defrost thermistor continue to read -1°C or below.
NOTE:
In case both thermistors are more than the above temperature, cool them with cold
water etc...
MUZ-GE•VAH