Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 281

11-5. Troubleshooting flow
When OPERATION INDICATOR lamp flashes 5-times.
Outdoor unit does not operate.
How to check inverter/ compressor
A
Disconnect the connector (CN61)
between compressor and the
intelligent power module (IPM).
Check the voltage
between terminals.
Are the voltages No
balanced?
Yes
Check the
compressor.
Check of open phase
B
●With the connector between the compressor and the intelligent
power module disconnected, activate the inverter and check if the
inverter is normal by measuring the balance of voltage between the
terminals.
Output voltage 115V
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION
switch on the indoor unit. (Test run operation : refer to 8-3.)
<<Measurement point>>
at 3 points
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of inverter P.C. board flashes 9 times.
(Refer to 11-6.1.)
See 11-5.B "Check of open phase" .
Replace the inverter P.C. board.
See 11-5.C "Check of compressor" .
Measure AC voltage between
the lead wires at 3 points.
Resolución de averías
9-time flash
2.5-second OFF
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