SELF-DIAGNOSIS Action Table | Mitsubishi Electronics PUY-A24NHA2-BS

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.

Error Code

Abnormal point and detection method

Case

Judgment and action

1No voltage is supplied to terminal 1 Check following items.

block(TB1) of outdoor unit.	a) Power supply breaker
a) Power supply breaker is	b) Connection of power supply terminal block
turned off.	(TB1)

b)Contact failure or discon- c) Connection of power supply terminal block

nection of power supply	(TB1)
terminal
c) Open phase (L1 or L2
phase)
2 Electric power is not charged	2 Check following items.
to power supply terminal of	a) Connection of power supply terminal block
outdoor power circuit board.	(TB1)
a) Contact failure of power	b) Connection of terminal on outdoor power
supply terminal	circuit board

b)Open phase on the outdoor A12-A24N: Disconnection of connector R or S

power circuit board	Refer to 10-9.
A12-A24N :Disconnection of	A30-A42N: Disconnection of connector TABT
connector R or S	or TABS Refer to 10-9.
A30-A42N :Disconnection of
connector TABT or TABS

3Electric power is not supplied to 3 Check connection of the connector (CNDC)

outdoor controller circuit board.	on the outdoor controller circuit board.
a) Disconnection of connector	Check connection of the connector, LD1 and
(CNDC)	LD2 for A12-A24N and CNDC for A30-A36N,
	on the outdoor power circuit board. Refer to
	10-9.

None

—

4Disconnection of reactor (DCL 4 Check connection of reactor. (DCL or ACL)

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-A42N: Check connection of “L1” and “L2”
	on the active filter module.(ACTM)
	Refer to 10-9.

5Disconnection of outdoor noise 5 a) Check connection of outdoor noise filter

filter circuit board or parts failure	circuit board.
in outdoor noise filter circuit	b) Replace outdoor noise filter circuit board.
board	Refer to 10-9.
As for A30-A42N type, it is
especially needed to check the
resistance RS1 on the noise
fiter circuit board.

6Defective outdoor power circuit 6 Replace outdoor power circuit board. board

7Defective outdoor controller 7 Replace controller board (When items above

circuit board

are checked but the units cannot be repaired).

63L connector open	1 Disconnection or contact failure	1 Check connection of 63L connector on
Abnormal if 63L connector circuit is open	of 63L connector on outdoor	outdoor controller circuit board.
for 3 minutes continuously after power sup-	controller circuit board	Refer to 10-9.
ply.	2 Disconnection or contact failure	2 Check the 63L side of connecting wire.
63L: Low-pressure switch	of 63L
<A42N only>	3 63L is working due to refriger-	3 Check refrigerant pressure.
<A42N only>	ant leakage or defective parts.	Charge additional refrigerant.
F3		Check continuity by tester.
(5202)		Check continuity by tester.
(5202)		Replace the parts if the parts are defective.
		Replace the parts if the parts are defective.
	4 Defective outdoor controller	4 Replace outdoor controller circuit board.
	circuit board

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