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When OPERATION INDICATOR lamp flashes 6-time.
Thermistors in the outdoor unit are abnormal.
W
Check of outdoor thermistor
Start
Defrost thermistor (RT61)
Measure
resistance
Turn OFF the
between CN 661
power supply.
1 and 2.
Unit operates COOL mode even if it is set to HEAT mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Check of R.V. coil
X
<MUH-07/09/12RV>
Does the resistance
of thermistor have
the characteristics ?
No
Replace the
thermistor.
<MUH-07/09/12RV>
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
After 3 minutes, does the unit
operate in COOL mode?
Is there 220-240V AC
between CN7211 – 2 on the
deicer P.C. board?
Replace the R.V. coil.
Re-connect CN661.
Turn ON the power
Yes
supply and press
the EMERGENCY
OPERATION
switch.
Defective contact of the connector is considered.
No
Ok
Yes
No
Replace the
deicer P.C. board.
Yes
23
Replace the deicer P.C.
board.
No
Does the unit operate
10 minutes or more?
Yes
Ok
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