Check Of Indoor Electronic Control P.c. Board; Check Of Outdoor Unit - Mitsubishi Electric MCF-13NV-E3 Service Manual

Check of indoor electronic control P.C. board

C
The unit doesn't operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn't light up by pressing the EMERGENCY OPERATION switch.
Check both "parts side"and "pattern
side" of indoor electronic control P.C.
board visually.

Check of outdoor unit

D
Compressor and / or outdoor fan does not operate.
Replace the fuse.
Is fuse(F11)blown?
Be sure to check both fuse
and varistor in any case.
Is varistor(NR11)burnt?
Replace the varistor.
Yes
Check the outdoor unit fan
motor and the compressor.
Yes
Check the continuity of indoor
and outdoor unit connection.
Yes
No
No
Yes
Start
Press the EMERGENCY
OPERATION switch. 3-minute time
delay works. Test run operation
operates for 30 minutes.
Check voltage to terminal
block of outdoor unit. Is there
220-240V AC to terminal
block between 2 - N ?
No
Check voltage to the
terminal block of indoor unit.
Is there 220-240V AC to
2 -
terminal block between
No
Replace the indoor
electronic control P.C.
board.
26
Replace the indoor electronic
control P.C. board.