41
Operation check of the solenoid valve.
P
Do you hear the operation sound
(click sound) of the solenoid valve
every 5 seconds?
Disconnect CN923 and measure the voltage
between the pins using tester.
Trouble of the solenoid
valve coil.
Are the cords between CN726, CN727 on the
outdoor power P.C. board and CN725 on the
outdoor inverter P.C. board firmly connected
without disconnection or loose connection?
Yes
No
Yes
No
Yes
Yes
No
No
Yes
No
No
Yes
Enter the failure mode recall function.
The solenoid valve is normal.
Check the ambient temperature
thermistor (RT65) in the outdoor unit.
Correct the connection.
Trouble of the solenoid
valve itself.
Trouble of the solenoid valve.
Is CN923 on the outdoor power P.C. board
firmly connected without disconnection or
loose connection?
Does it repeat to go 0V and 230VAC at 5
second interval?
Correct the connection.
Measure the voltage between CN725
8
(+)
and
2
(GND) on the outdoor inverter P.C.
board.
Does it repeat to go 0V and 12VDC at 5
second interval?
Measure the solenoid valve resistance.
Is the resistance normal ? (Open or short:
abnormal) Refer to 11-5.
Replace the inverter P.C. board.
Replace the power P.C. board.
When the cool air does not blow out from the indoor unit in Low Outside Temperature Operation, or the condensed
water drops from the indoor unit.
OB379 --2qxp 05.1.17 16:38 Page 41
Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
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