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Self-Diagnosis Action Table - Mitsubishi Electric PUZ-A18NHA Service Manual

Split-type, heat pump air conditioners split-type, air conditioners outdoor unit
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11-4. 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.
Error Code Meaning of error code and detection method
None
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously after power sup-
ply.
63L: Low-pressure switch
F3
<A42N only>
(5202)
1 No voltage is supplied to terminal
block(TB1) of outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or discon-
nection of power supply
terminal
c) Open phase (L1 or L2
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
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 failure
in outdoor noise filter circuit
board
6 Open circuit of rush current
protect resistor (RS)
7 Defective outdoor power circuit
board
8 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
33
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
A12-A24N: Disconnection of connector R or S
A30-A42N: Disconnection of connector TABT
3 Check connection of the connector (CNDC)
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
11-9.
4 Check connection of reactor. (DCL or ACL)
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-A36N: Check connection of "L1" and "L2"
on the active filter module.(ACTM)
Refer to 11-9.
5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to 11-9.
6 a) Check resistance value of rush current
protect resister (RS).
Normal:
b) Replace the rush current protect resister
(RS).
*There is a possibility that power board or
controller board or ACTM is short - circuited
when RS is open - circuited.
Check these parts.
7 Replace outdoor power circuit board.
8 Replace controller 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 11-9.
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.
Judgment and action
Refer to 11-9.
or TABS Refer to 11-9.
5.6'

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