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Mitsubishi Electric PUHZ-W85VHA Service Manual Page 12

Air to water heat pump.
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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
1 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)
2 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
3 Electric power is not supplied to
outdoor controller circuit board.
a) Connector disconnected
(CNDC)
4 Disconnection of reactor (DCL)
5 Disconnection of outdoor noise
filter circuit board or parts fail-
ure in outdoor noise filter circuit
board
6 Defective outdoor power circuit
board
7 Defective outdoor controller
circuit board
1 Disconnection or contact failure
of 63H connector on outdoor
controller circuit board
2 Disconnection or contact failure
of 63H
3 63H is working due to defective
parts.
4 Defective outdoor controller
circuit board
Case
1 Check following items.
2 Check following items.
LI, NI, LO, NO
TABT or TABS
3 Check connection of the CNDC connector,
4 Check connection of reactor. (DCL)
5 Replace outdoor noise filter circuit board.
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board (When
1 Check connection of 63H connector on
2 Check the 63H side of connecting wire.
3 Check for continuity of 63H.
4 Replace outdoor controller circuit board.
12
Judgment and action
a) Power supply breaker
b) Connection of power supply terminal block.
(TB1)
c) Connection of power supply terminal block.
(TB1)
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.
on the outdoor power circuit board.
Refer to 8-6.
Check connection of "L1" and "L2" on the
active filter module. (ACTM) Refer to 8-6.
Refer to 8-6.
items above are checked but the units cannot
be repaired.)
outdoor controller circuit board.
Refer to 8-6.
Replace high pressure switch if it is defective.

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