Mitsubishi Electric SLH Series Technical & Service Manual page 59

From the preceding page.
Is the connecting
wire between the
indoor unit and
the decoration
panel connected
No
Yes
Connection is defective.
Connection is defective.
The switch of remote controller does not work.
Is the varistor on
the indoor controller
board burnt?
Yes
No
Replace the varistor.
Indoor controller board is defective.
Indoor fan motor does not rotate.
Turn off the power supply and check the connectors
FAN1 and 2 on the indoor controller board visually.
Are the connectors FAN1 and 2
connected?
No
Measure the resistance of connectors FAN1
and 2 on the indoor controller board.
Is the resistance 0 (short circuit) or
∞ (open circuit)?
No
Indoor controller board is defective.
Indoor fan motor is defective.
Is the fuse on the
indoor controller
board melted?
Yes
No
Replace the fuse.
No
Replace the
remote controller.
Yes
Yes
59
Check the followings.
•The display on the remote controller does
not appear on the screen.
•The display on the remote controller is dim.
•The indoor unit does not respond to the
remote control signal when the remote
controller is not operated near the signal
receiving section on the unit.
Replace the batteries.
Does the display appear on the
screen?
Does the indoor unit receive the
remote control signal when the
remote controller is not operated
near the signal receiving section
on the unit?
Yes