Mitsubishi Electric PUHZ-W50VHA Service Manual page 53

9-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check Code Abnormal point and detection method
None
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously from being
switched on.
63L: Low pressure switch
F3
OCH439M
1 No voltage is supplied to terminal
block (TB1) of outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or
disconnection of power
supply terminal
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
supply terminal
b) Open phase on the outdoor
power circuit board
W50:
Disconnection of connector R or S
W85:
Disconnection of connector
TABT or TABS
HW140V:
Disconnection of connector LI, NI
3 Electric power is not supplied
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
—
b) Disconnection of connector
(CN52C)
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 cir-
cuit board
7 Defective outdoor controller
circuit board
1 Disconnection or contact fail-
ure of 63L connector on out-
door controller circuit board
2 Disconnection or contact fail-
ure of 63L
3 63L is working due to refriger-
ant leakage or defective parts.
4 Defective outdoor controller
circuit board
53
Cause
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. TEST POINT DIAGRAM".
W85:
Check connection of the connector TABT or TABS.
Refer to "9-6. TEST POINT DIAGRAM".
HW140V:
Check connection of the connector LI or NI.
Refer to "9-6. TEST POINT DIAGRAM".
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).
Check connection of the connector (CN52C)
on the noise filter circuit board for W50/
W85, or the outdoor power circuit board
for HW140V. Refer to "9-6. TEST POINT
DIAGRAM".
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. TEST POINT DIAGRAM".
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. TEST POINT
DIAGRAM".
b) Replace outdoor noise filter circuit board.
Refer to "9-6. TEST POINT DIAGRAM".
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board
(When items above are checked but the
units cannot be repaired.)
1 Check connection of 63L connector on
outdoor controller circuit board.
Refer to "9-6. TEST POINT DIAGRAM".
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.
Judgment and action