Mitsubishi Electric MUH-GA20VB-E1 Service Manual page 25

When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.
E E Check of outdoor thermistor
Start
Defrost thermistor (RT61)
Measure
resistance
Turn OFF the
between CN 661
power supply.
1 and 2.
Reconnect CN661.
Turn ON the power
Yes
Is the resistance of
supply and press
thermistor normal?
the EMERGENCY
OPERATION switch.
No
Replace the
thermistor.
25
Replace the deicer P.C.
board.
Does the unit operate
10 minutes or more?
OK
Defective contact of the connector is considered.
No
Yes