Mitsubishi PUHZ-SHW80YAA Service Manual page 29

Symptoms: Nothing is displayed on the remote controller. 1
Check the voltage between S1
and S2 on the terminal block
of the indoor unit which is used
to connect the indoor unit and
the outdoor unit.
198 to 264 V AC?
YES
OCH651
NO
Check the voltage among L(L
N on the terminal block (TB1) of the
outdoor power circuit board.
198 to 264 V AC?
YES
Check the voltage between S1
and S2 on the terminal block
(TB1) of the outdoor unit which
is used to connect the indoor
unit and the outdoor unit.
198 to 264 V AC?
YES
Cause
) and
3
NO
Troubles concerning
power supply
NO
outdoor controller
board
outdoor controller
circuit board are
blown.
outdoor controller
board
outdoor controller
circuit board are
blown.
indoor controller
circuit board are
blown.
controller board
controller board
Inspection method and
troubleshooting
to the outdoor unit.
outdoor unit.
Check if the fuses are blown.
The fuses on the outdoor
controller circuit board will
be blown when the indoor
/outdoor connecting wire
short-circuits.
or poor contact is causing this
problem. Indoor/outdoor
connecting wire is polarized
3-core type. Connect the
indoor unit and the outdoor
unit by wiring each pair of
side of indoor/outdoor
terminal blocks.
blown.
controller board.