Checking The Fan Inverter For Damage With Load; Checking The Installation Conditions - Mitsubishi Electric R410A Service Handbook

[8-9 Troubleshooting Inverter Problems (TLMU) ]
8-9-9

Checking the Fan Inverter for Damage with Load

Check list
(1) Turn off breaker.
(2) Turn on breaker.
(3) Operate unit.
8-9-10

Checking the Installation Conditions

Items to be checked
(1) Check refrigerant charge.
(2) Check outdoor unit branch in-
stallation.
HWE14080
Phenomenon
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
2) RPM error before stat-up
Check code: 5305, 5306
Detail code: 134
3) Electrical current overload error during
operation
Check code: 4255, 4256
Detail code: 101
4) Sensor error during operation
Check code: 5305, 5306
Detail code: 132, 133
5) Voltage overload error
Check code: 4225, 4226
Detail code: 109
6) Load short circuit
Check code: 4255, 4256.
Detail code: 105
7) After RPM has stabilized, voltage unbal-
ance of 5%, or 5V.
Phenomena
Overcharge of refrigerant
The branch approach <500 mm.
Is the branch angle < ±15° to horizontal? Make branch angle < ±15°
- 270 -
Resolution
Check for fan motor lock.
If locked, change for fan motor.
If the same error is still present
after changing fan motor, change
fan board.
If not locked, refer to 3) & 4).
Change Fan board if the same
error occurs after restart.
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.
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.
a. Check for gusts or windy conditions.
b. Change Fan board if it is not windy.
a. Check 8-9-7 and 8-9-8. If no prob-
lem, then check wiring for short 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.
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.
Remedy
Return to correct refrigerant
charge.
Make branch approach >500mm
GB