Check Of Outdoor Thermistor - Mitsubishi MUH-GA50VB Service Manual

When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.

Check of outdoor thermistor

F
w Disconnect the connectors CN661 and/ or CN662 from the deicer P.C. board.
(Check the characteristics of each thermistor.)
Defrost thermistor(RT61)
<MUH-GA80VB>
Discharge temperature
thermistor(RT62)
Measure
resistance
Turn OFF the
between CN 662
power supply.
1 and 2.
<MUH-GA80VB>
Ambient temperature
thermistor(RT63)
Measure
resistance
between CN 661
1 and 2.
Does the resistance
of thermistor have the
characteristics
on 10-5?
Replace the
thermistor.
Measure
resistance
between CN 662
3 and 4.
Connect CN661 and
CN662.
Turn ON the power
Yes
supply and press
the EMERGENCY
OPERATION switch.
No
33
Replace the deicer P.C.
board.
No
Does the unit operate
10 minutes or more?
Yes
Ok W.
W It is thought defective contact of the connector.