Check Of R. V. Coil - Mitsubishi Electric MSZ-G09SV Service Manual

When OPERATION INDICATOR lamp flashes 10-time.

Check of R. V. coil

W
• When heating operation doesn't work.
Start
1. Disconnect the lead wire from the compressor.
2. Turn ON power supply, opearate the unit in HEAT
mode by pressing EMERGENCY OPERATION switch.
After three minutes, is the voltage 230V AC
between No.1 and No. 2 at connector CN912 on
noise filter P. C. board?
Yes
1.Turn OFF power supply.
2. Disconnect the connector CN912, and measure
the resistance of R. V. coil.
Is the resistance of R.V.
No
coil normal?
Yes
Replace the 4-way valve.
• When cooling operation doesn't work.
Start
1. Disconnect the lead wire from the compressor.
2. Turn ON power supply, opearate the unit in COOL
mode by pressing EMERGENCY OPERATION switch.
After three minutes, is the voltage 230V AC
between No.1 and No.2 at connector CN912 on
noise filter P. C. board?
Yes
1. Turn OFF power supply, and disconnect the connector CN851
on outdoor electronic control P. C. board.
2. Turn on power supply, opearate the unit in COOL
mode by pressing EMERGENCY OPERATION switch.
After three minutes, is the voltage
12V DC between No.3(+) and No.4(-)
at connector CN851 on outdoor
electronic conrol P.C. board? W1
Yes
Replace the outdoor
electronic control P. C. board.
1. Turn off power supply and disconnect the
connector CN851 on outdoor electronic control P. C.
No
board.
2. Turn on power supply, opearate the unit in HEAT
mode by pressing EMERGENCY OPERATION switch.
After three minutes, is the voltage
12V DC between No.3(+) and No.4(-)
at connector CN851 on outdoor
electronic control P. C. board?
Replace the R. V. coil
Replace the noise filter P. C. board.
No
Replace the 4-way valve.
No
Replace the noise filter P. C. board.
W1 If the connector CN912 is not connected or R. V. coil is open, voltage
occurs between terminals even when the control is OFF.
No
Yes
87
Replace the outdoor
electronic control P. C. board.