Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 285

Inverter does not operate.
Check of power supply
J
Disconnect the connector
(CN61) between compressor and
intelligent power module.
Turn ON power supply and press
EMERGENCY OPERATION
switch.
Does the upper lamp of
OPERATION INDICATOR
lamp on the indoor unit
light up?
Yes
Is there voltage
280V ~ 370V DC
between DB61 (+) and
DB61 (–) on the
inverter P.C. board?
(Refer to 11-6.1.)
No
Check the electric
parts in main circuit.
Rectify indoor/ outdoor
connecting wire.
Yes
Is there voltage 230V AC
No
between the indoor
terminal block S1 and
S2?
Dose LED on the inverter
Yes
P.C. board light up or
flash? (Refer to 11-6.1.)
Yes
If light up,ok.
If flash, refer to
11-3.
Resolución de averías
Replace the indoor
No
electronic control
P.C. board.
No
Replace the inverter
P.C. board.
280V~370V DC
DB61
Inverter P.C. board
(Solder side)
285