Mitsubishi Electric PUHZ-FRP71VHA2 Service Manual page 26

10-4. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is put on>
Abnormal points and detection method
Check Code
None
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously after power sup-
ply.
63H: High pressure switch
F5
(5201)
OCH665B
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 (DCL)
5 Defective outdoor power circuit
board
6 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 1) Refer to indoor unit section for code P and code E.
Cause
1 Check following items.
a) Power supply breaker
b) Connection of power supply terminal
c) Connection of power supply terminal
2 Check following items.
a) Connection of power supply terminal block.
b) Connection of terminal on outdoor power
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
4 Check connection of reactor. (DCL)
Check connection of TB1A, TB3A, TB1B and
TB3B on the outdoor power circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
5 Replace outdoor power circuit board.
6 Replace controller board (When items
above are checked but the units cannot be
repaired.)
1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
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.
26
Judgment and action
block. (TB1)
block. (TB1)
(TB1)
circuit board.