Self-Diagnosis Action Table - Mitsubishi Electric PUHZ-SHW230YKA2 Service Manual

8-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on>
Check Code Abnormal point 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
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously after power sup-
ply.
63H: High pressure switch
F5
2 connector open
Abnormal if both 63H and 63L connector
circuits are open for three minutes continu-
ously after power supply.
F9 63H: High pressure switch
63L: Low pressure switch
OCH594B
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 charged 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
3 Electric power is not supplied
—
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (DCL)
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 Open of rush current resistor (RS)
(Only for YKA2R2 type)
8 Defective outdoor controller cir-
cuit 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 cir-
cuit 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 cir-
cuit board
1 Disconnection or contact failure
of connector (63H,63L) on out-
door controller circuit board.
2 Disconnection or contact failure
of 63H, 63L
3 63H and 63L are working due
to defective parts.
4 Defective outdoor controller
board.
Case
1 Check following items.
2 Check following items.
3 Check connection of the connector (CNDC)
4 Check connection of reactor. (DCL)
5 a) Check connection of outdoor noise filter
6 Replace outdoor power circuit board.
7 Replace rush current protect resistor (RS).
8 Replace controller board (When items above
1 Check connection of 63L connector on
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
4 Replace outdoor controller circuit board.
1 Check connection of 63H connector on out-
2 Check the 63H side of connecting wire.
3 Check continuity by tester.
4 Replace outdoor controller circuit board.
1 Check connection of connector (63H,63L) on
2 Check the 63H and 63L side of connecting
3 Check continuity by tester.
4 Replace outdoor controller circuit board.
17
Judgment and action
a) Power supply breaker
b) Connection of power supply terminal block
(TB1)
c) Connection of power supply terminal block
(TB1)
a) Connection of power supply terminal block
(TB1)
b) Connection of terminal on outdoor
power circuit board
on the outdoor controller circuit board.
Check connection of the connector CNDC on
the outdoor noise filter. Refer to "8-7. TEST
POINT DIAGRAM".
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to "8-7. TEST POINT DIAGRAM".
Power circuit board might be short-circuit.
Check the power circuit board.
(Refer to "8-7. TEST POINT DIAGRAM".)
(Only for YKA2R2 type)
are checked but the units cannot be repaired).
outdoor controller circuit board.
Refer to "8-7. TEST POINT DIAGRAM".
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.
door controller circuit board.
Refer to "8-7. TEST POINT DIAGRAM".
Replace the parts if the parts are defective.
outdoor controller circuit board.
Refer to "8-7. TEST POINT DIAGRAM".
wire.
Replace the parts if the parts are defective.