42
9-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
(Note 1) Refer to indoor unit section for code P and code E.
Error Code
Abnormal point 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 (L1 or L2 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
Disconnection of terminal LI
or NI.
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
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.
Disconnection of terminal LI or NI.
Refer to 9-7.
3
Check
connection of the connector (CNDC)
on the outdoor controller circuit board.
Check
connection of the connector (CNDC)
on the outdoor power circuit board.
Refer to 9-7.
4
Check
connection of reactor. (DCL)
Check connection of “DCL1” and “DCL2”
on the power circuit board.
5
Replace outdoor power circuit board.
6
Replace controller board (When items
above are checked but the units cannot be
repaired.)
F3
(5202)
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously after power sup-
ply
63L: Low-pressure switch
1
Disconnection or contact failure
of 63L connector on outdoor
controller circuit board
2
Disconnection or contact failure
of 63L
3
63L is operating due to refriger-
ant leakage or defective parts.
4
Defective outdoor controller
circuit
board
1
Check connection of 63L connector on
outdoor controller circuit board.
Refer to 9-7.
2
Check the 63L side of connecting wire.
3
Check refrigerant pressure.
Charge additional refrigerant.
Check continuity with a tester.
Replace the parts if the parts are defective.
4
Replace outdoor controller circuit board.
F9
(4119)
2 connector open
Abnormal if both 63H and 63L connector
circuits are open for 3 minutes continuously
after power supply
63H: High-pressure switch
63L: Low-pressure switch
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 operating due
to defective parts.
4
Defective outdoor controller
board
1
Check connection of connector (63H,63L) on
outdoor controller circuit board.
Refer to 9-7.
2
Check the 63H and 63L side of connecting
wire.
3
Check continuity with a tester.
Replace the parts if the parts are defective.
4
Replace outdoor controller circuit board.
F5
(5201)
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 operating due to defec-
tive parts.
4
Defective outdoor controller
circuit
board
1
Check connection of 63H connector on
outdoor controller circuit board.
Refer to 9-7.
2
Check the 63H side of connecting wire.
3
Check continuity with a tester.
Replace the parts if the parts are defective.
4
Replace outdoor controller circuit board.
Summary of Contents for MXZ-8B48NA
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