Self-Diagnosis Action Table - Mitsubishi Electric PUHZ-SW75VHA Service Manual

10-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on>
Abnormal point and detection method
Error Code
None
63L connector open (SW100/120 only)
Abnormal if 63L connector circuit is open for
3 minutes continuously after power supply.
63L: Low-pressure switch
F3
63H connector open
Abnormal if 63H connector circuit is open for
3 minutes continuously after power supply.
63H: High-pressure switch
F5
OCH533A
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
SW75VHA : Disconnection
of connector R or S
SW100/120VHA :
Disconnection of connector
LI or NI
3 Electric power is not supplied
—
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (DCL
or ACL)
5 Disconnection of outdoor noise
filter circuit board or parts failure
in outdoor noise filter circuit
board
As for SW75VHA, it is
especially needed to check the
resistance RS on the 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
refrigerant leakage or defective
parts.
4 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
Note: Refer to indoor unit section for code P and code E.
Case
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
SW75VHA: Check connection of the con-
SW100/120VHA : Check connection of the
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Check connection of the connector, CNDC on
the outdoor power circuit board(V)/the noise
filter(Y). Refer to 10-7.
4 Check connection of reactor. (DCL or ACL)
SW75VHA : Check connection of "LO" and "NO"
SW100/120VHA : Check connection of
5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to 10-7.
6 Replace outdoor power circuit board.
7 Replace controller 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 10-7.
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.
1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to 10-7.
2 Check the 63H side of connecting wire.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.
22
Judgment and action
nector R or S. Refer to
10-7.
connector LI or NI.
Refer to 10-7.
on the outdoor noise filter circuit
board. Check connection of "R"
and "S" on the outdoor power
circuit board. Refer to 10-7.
"DCL1" and "DCL2" on
the outdoor power circuit
board. Refer to 10-7.