Self-Diagnosis Action Table - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

9-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is put on>
Abnormal point and detection method
Error Code
None
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously after power sup-
ply
63L: Low-pressure switch
F3
(5202)
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously after power sup-
ply
F5
63H: High-pressure switch
(5201)
2 connector open
Abnormal if both 63H and 63L connector
circuits are open for 3 minutes continuous-
ly after power supply
F9
(4119)
63H: High-pressure switch
63L: Low-pressure switch
1 No voltage is supplied to termi-
nal block(TB1) of outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or discon-
nection of power supply ter-
minal
c) Open phase (L or N phase)
2 Electric power is not charged
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 connector
SC-R or SC-S
—
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 Defective outdoor controller
circuit 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
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
1 Disconnection or contact failure
of connector (63H,63L) on
outdoor 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
(Note 1) Refer to indoor unit section for code P and code E.
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 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
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.
43
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.
Disconnection of connector SC-R or
SC-S
Refer to 9-7.
on the outdoor controller circuit board.
Check connection of the connector, CNDC
on the outdoor power circuit board.
Refer to 9-7.
Check connection of "L1" and "L2"
on the active filter module.(ACTM)
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to 9-7.
are checked but the units cannot be
repaired.)
outdoor controller circuit board.
Refer to 9-7.
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.
outdoor controller circuit board.
Refer to 9-7.
Replace the parts if the parts are defective.
outdoor controller circuit board.
Refer to 9-7.
wire.
Replace the parts if the parts are defective.