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Self-Diagnosis Action Table - Mitsubishi Electric PUHZ-W90VHA Service Manual

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8-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on>
Abnormal point and detection method
Error Code
None
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously from being
switched on.
63H: High-pressure switch
F5
No voltage is supplied to terminal
block(TB1) of outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or disconnec-
tion of power supply
terminal
c) Open phase (L or N phase)
Electric power is not supplied
to power supply terminal of
noise filter circuit board / out-
door power circuit board.
a) Contact failure of power
supply terminal
b) Open phase on the noise
filter circuit board / outdoor
power circuit board
: Disconnection of terminal
: Disconnection of terminal
Electric power is not supplied to
outdoor controller circuit board.
a) Connector disconnected
(CNDC)
Disconnection of reactor (DCL)
Disconnection of outdoor noise
filter circuit board or parts fail-
ure in outdoor noise filter circuit
board
Defective outdoor power circuit
board
Defective outdoor controller
circuit board
Disconnection or contact failure
of 63H connector on outdoor
controller circuit board
Disconnection or contact failure
of 63H
63H is working due to defective
parts.
Defective outdoor controller
circuit board
Case
LI, NI, LO, NO
TABT or TABS
12
Judgment and action
Check following items.
a) Power supply breaker
b) Connection of power supply terminal block.
(TB1)
c) Connection of power supply terminal block.
(TB1)
Check following items.
a) Connection of power supply terminal block.
(TB1)
Connection of terminal (LI, NI, LO, NO) on
the noise filter circuit board
b) Connection of terminal (TABT or TABS) on
outdoor power circuit board.
Refer to 8-6.
Check connection of the CNDC connector,
on the outdoor power circuit board.
Refer to 8-6.
Check connection of reactor. (DCL)
Check connection of "L1" and "L2" on the
active filter module.(ACTM) Refer to 8-6.
Replace outdoor noise filter circuit board.
Refer to 8-6.
Replace outdoor power circuit board.
Replace outdoor controller circuit board (When
items above are checked but the units cannot
be repaired.)
Check connection of 63H connector on
outdoor controller circuit board.
Refer to 8-6.
Check the 63H side of connecting wire.
Check for continuity of 63H.
Replace high pressure swich if it is defective.
Replace outdoor controller circuit board.

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