Mitsubishi Electric PUHZ-SW50VHA Service Manual download pdf (Page 15)

15

10-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is put on>

(Note 1) Refer to indoor unit section for code P and code E.

Error Code

Abnormal points and detection method

Case

Judgment and action

None

—

1 No voltage is supplied to termi-

nal 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 (L or N phase)

2 Electric power is not supplied

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

(Disconnection of terminal

on outdoor power circuit

board)

3 Electric power is not supplied

to outdoor controller circuit

board.

a) Disconnection of connector

(CNDC)

4 Disconnection of reactor (ACL)

5 Disconnection of outdoor noise

filter circuit board or parts fail-

ure in outdoor noise filter circuit

board

6 Defective outdoor power circuit

board

7 Defective outdoor controller

circuit board

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.

3 Check connection of the connector (CNDC)

on the outdoor controller circuit board.

Check connection of the connector, LD1

and LD2 on the outdoor power circuit board.

Refer to 10-9.

4 Check connection of reactor. (ACL)

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.

Refer to 10-9.

5 a) Check connection of outdoor noise filter

circuit board.

b) Replace outdoor noise filter circuit board.

Refer to 10-9.

6 Replace outdoor power circuit board.

7 Replace controller board (When items

above are checked but the units can not be

repaired.)

F5

63H connector open

Abnormal if 63H connector circuit is open

for 3 minutes continuously after power sup-

ply.

63H: High-pressure switch

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

1 Check connection of 63H connector on

outdoor controller circuit board.

Refer to 10-9.

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.

OCH525

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