Self-Diagnosis Action Table - Mitsubishi Electric PUZ-A18NHA4 Service Manual

10-4. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on> (Note 1) Refer to indoor unit section for code P and code E.
Abnormal point and detection method
Error Code
None
63L connector open
Abnormal if 63L connector circuit is open for
3 minutes continuously after power supply.
63L: Low-pressure switch
<A42N only>
F3
(5202)
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 (L1 or L2 phase)
2 Electric power is not charged to
power supply terminal of out-
door power circuit board.
a) Contact failure of power
supply terminal
b) Open phase on the outdoor
power circuit board
A12-A24N :Disconnection of
connector R or S
A30-A42N :Disconnection of
connector TABT or TABS
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 fail-
ure in outdoor noise filter circuit
board
As for A30-A42N type, it is
especially needed to check the
resistance RS1 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 operating due to refriger-
ant leakage or defective parts.
4 Defective outdoor controller
circuit board
Case
1 Check following items.
2 Check following items.
3 Check connection of the connector (CNDC)
4 Check connection of reactor. (DCL or ACL)
5 a) Check connection of outdoor noise filter
6 Replace outdoor power circuit board.
7 Replace controller board (When items above
1 Check connection of 63L connector on
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
4 Replace outdoor controller circuit board.
35
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)
b) Connection of terminal on outdoor power
circuit board
A12-A24N: Disconnection of connector R or S
Refer to 10-9.
A30-A42N: Disconnection of connector TABT
or TABS Refer to 10-9.
on the outdoor controller circuit board.
Check connection of the connector, LD1 and
LD2 for A12-A24N and CNDC for A30-A36N,
on the outdoor power circuit board.
Refer to 10-9.
A12-A24N: 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.
A30-A42N: Check connection of "L1" and "L2"
on the active filter module. (ACTM)
Refer to 10-9.
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to 10-9.
are checked but the units cannot be repaired).
outdoor controller circuit board.
Refer to 10-9.
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.