Mitsubishi PUHZ-SHW112YAA - Page 29


198 to 264 V AC?
198 to 264 V AC?
198 to 264 V AC?
NO
YES
NO
YES
NO
YES
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.
Check the voltage among L(L3) and
N on the terminal block (TB1) of the
outdoor power circuit board.
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.

Troubles concerning
power supply
&KHFNWKHSRZHUZLULQJ
to the outdoor unit.
&KHFNWKHEUHDNHU
%DGZLULQJRIWKH
outdoor controller
board
7KHIXVHVRQWKH
outdoor controller
circuit board are
blown.
&KHFNWKHZLULQJRIWKH
outdoor unit.
&KHFNLIWKHZLULQJLVEDG
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.
%DGZLULQJRIWKH
outdoor controller
board
7KHIXVHVRQWKH
outdoor controller
circuit board are
blown.
&KHFNLIPLVZLULQJEUHDNLQJ
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
66DQG6RQWKHERWK
side of indoor/outdoor
terminal blocks.
7KHIXVHVRQWKH
indoor controller
circuit board are
blown.
'HIHFWLYHLQGRRU
controller board
&KHFNLIWKHIXVHVDUH

blown.
5HSODFHWKHLQGRRU
controller board.
Symptoms: Nothing is displayed on the remote controller. 1
'LDJQRVLVIORZCause
Inspection method and
troubleshooting
/('GLVSOD\RIWKHLQGRRU
controller board
/('
/('
/('
OCH651