Self-Diagnosis Action Table - Mitsubishi Electric Mr.SLIM PUZ-ZM200YKA Service Manual

10-4. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is put on>
Check Code Abnormal points and detection method
None
63H or TRS connector open
Abnormal if 63H or TRS connector circuit is
open for 3 minutes continuously after power
supply.
63H: High pressure switch
TRS:Thermal protector
F5
(5201)
OCH738
1 No voltage is supplied to terminal
block (TB1) of outdoor unit.
a) Power supply breaker is turned
off.
b) Contact failure or disconnection
of power supply terminal
c) Open phase (L2 or N phase)
2 Electric power is not supplied 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
(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 or
ACL4)
5 Disconnection of outdoor noise fil-
ter circuit board or parts failure in
outdoor noise filter circuit board.
6 Defective outdoor power circuit
board
7 Open of rush current protect resis-
tor (RS)
8 Defective outdoor controller circuit
board
1 Disconnection or contact failure of
63H or TRS connector on outdoor
controller circuit board
2 Disconnection or contact failure of
63H or TRS
3 63H or TRS is working due to
defective parts.
4 Defective outdoor controller circuit
board
Note: Refer to indoor unit section for codes starting with P and E.
Cause
35
Judgment and action
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 CNDC
on the noise filter circuit board. Refer to
"10-9. TEST POINT DIAGRAM".
4 Check connection of reactor. (DCL or
ACL4) Refer to "7. WIRING DIAGRAM".
5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit
board. Refer to "10-9. TEST POINT
DIAGRAM".
6 Replace outdoor power circuit board.
7 Replace rush current protect resistor (RS).
Power circuit board might be short-circuit.
Check the power circuit board. (Refer to
"10-9. TEST POINT DIAGRAM".)
8 Replace controller board (When items
above are checked but the units cannot be
repaired.)
1 Check connection of 63H and TRS
connector on outdoor controller circuit
board.
Refer to "10-9. TEST POINT DIAGRAM".
2 Check the 63H and TRS side of connect-
ing wire.
3 Check continuity by tester.
Replace the parts if the parts are defec-
tive.
4 Replace outdoor controller circuit board.