[8-9 Troubleshooting Inverter Problems ]
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HWE12050 GB
8 Troubleshooting Based on Observed Symptoms
8-9-9 Checking the Fan Inverter for Damage with Load
8-9-10 Checking the Installation Conditions
Items to be checked Phenomena Remedy
(1) Turn off breaker. 1) After operation, electrical overload error
or position detection error and unit stops
within 10 seconds.
Check code: 4255, 4256, 5305, 5306
Detail code: 101, 132
Check for fan motor lock.
If locked, change for fan mo-
tor.
If the same error is still present
after changing fan motor, change
Fan board.
If not locked, refer to 3) & 4).
(2) Turn on breaker. 2) RPM error before stat-up
Check code: 5305, 5306
Detail code: 134
Change Fan board if the same
error occurs after restart.
(3) Operate unit. 3) Electrical current overload error during
operation
Check code: 4255, 4256
Detail code: 101
a. Check for gusts or windy conditions.
b. Go to 8-9-6 if not windy.
c. After checking 8-9-6, and there is no
problem, change Fan board.
d. If replacing Fan board doesn't re-
solve issue, change fan motor.
4) Sensor error during operation
Check code: 5305, 5306
Detail code: 132, 133
a. Check for gusts or windy conditions.
b. If no issues with wind, but the error
is still present, change Fan board.
c. Change fan motor if Fan board
change doesn't resolve issue.
5) Voltage overload error
Check code: 4225, 4226
Detail code: 109
a. Check for gusts or windy conditions.
b. Change Fan board if it is not windy.
6) Load short circuit
Check code: 4255, 4256.
Detail code: 105
a. Check 8-9-7 and 8-9-8. If no prob-
lem, then check wiring forshort cir-
cuit.
b. If there is no problem with item a.
above, change fan motor.
c. If same error after motor change,
change Fan board.
7) After RPM has stabilized, voltage unbal-
ance of 5%, or 5V.
a. If voltage is unbalanced, go to 8-9-6
b. After checking 8-9-6, and there is no
problem, change Fan board.
c. If replacing Fan board doesn't re-
solve issue, change fan motor.
Items to be checked Phenomena Remedy
(1) Check refrigerant charge. Overcharge of refrigerant Return to correct refrigerant
charge.
(2) Check outdoor unit branch in-
stallation.
The branch approach <500 mm. Make branch approach >500mm
Is the branch angle < ±15° to horizontal? Make branch angle < ±15°
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