Mitsubishi Electric PUHZ-W50VHA-BS Service Manual page 44

9-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Abnormal point and detection method
Error Code
None
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously from being
switched on.
63L: Low-pressure switch
F3
OCH439H
1 No voltage is supplied to terminal
block (TB1) of outdoor unit.
a) Power supply breaker is
b) Contact failure or
c) Open phase (L or N phase)
2 Electric power is not charged
to power supply terminal of
outdoor power circuit board.
a) Contact failure of power
b) Open phase on the outdoor
3 Electric power is not supplied
to outdoor controller circuit
board.
a) Disconnection of connector
—
4 Disconnection of reactor (DCL
or ACL)
5 Disconnection of outdoor noise
filter circuit board or parts
failure in outdoor noise filter
circuit board
6 Defective outdoor power circuit
board
7 Defective outdoor controller
circuit board
1 Disconnection or contact failure
of 63L connector on outdoor
controller circuit board
2 Disconnection or contact failure
of 63L
3 63L is working due to refriger-
ant leakage or defective parts.
4 Defective outdoor controller
circuit board
Case
turned off.
disconnection of power
supply terminal
supply terminal
power circuit board
W50 :
Disconnection of connector R or S
W85 :
Disconnection of connector
TABT or TABS
HW140V :
Disconnection of connector LI, NI
(CNDC)
44
Judgment and action
1 Check following items.
a) Power supply breaker
b) Connection of power supply terminal
block. (TB1)
c) Connection of power supply terminal
block. (TB1)
2 Check following items.
a) Connection of power supply terminal block.
(TB1)
b) Connection of terminal on outdoor power
circuit board.
W50 :
Check connection of the connector R or S.
Refer to 9-6.
W85 :
Check connection of the connector TABT or TABS.
Refer to 9-6.
HW140V :
Check connection of the connector LI or NI.
Refer to 9-6.
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Check connection of the connector, LD1 and
LD2 for W50 and CNDC for W85/HW112/
HW140, on the outdoor power circuit board
(V) / noise filter (Y). Refer to 9-6.
.
4 Check connection of reactor. (DCL or ACL)
W50 : Check connection of "LO" and
"NO" on the outdoor noise filter circuit board.
Check connection of "R" and "S" on the
outdoor power circuit board.
W85 : Check connection of "L1" and "L2" on
the active filter module. (ACTM)
Refer to 9-6.
HW140V :
Check connection of "DCL1" and "DCL2" on
the outdoor power circuit board.
5 a) Check connection of outdoor noise filter
circuit board. Refer to 9-6.
b) Replace outdoor noise filter circuit board.
Refer to 9-6.
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board
(When items above are checked but the units
can not be repaired.)
1 Check connection of 63L connector on
outdoor controller circuit board.
Refer to 9-6.
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
Charge additional refrigerant.
Check continuity of 63L.
Replace low pressure switch if it is defective.
4 Replace outdoor controller circuit board.