Checking The Fan Board For Damage With Load - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[8-10 Troubleshooting Inverter Problems ]
8-10-10

Checking the Fan Board for Damage with Load

Items to be checked
(1) Turn off breaker.
(2) Turn on breaker.
(3) Operate unit.
48
- chapter 8
Phenomena
1) The operation stops within 20 seconds
of startup and a step-out error or an
overcurrent error occurs.
Check code: 4255, 4256
Detail code: 101, 106, 107, 137
2) Motor synchronization loss or electrical
current overload during operation
Check code: 4255, 4256
Detail code: 101, 106, 107, 137
3) Sensor error during operation
Check code: 5305, 5306
Detail code: 135, 136
4) Voltage overload error
Check code: 4225, 4226
Detail code: 109
5) Load short circuit
Check code: 4255, 4256.
Detail code: 105
6) After RPM has stabilized, voltage unbal-
ance of 5%, or 5V.
Remedy
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).
a. Check for gusts or windy conditions.
b. Go to [8-10-8 Checking the Fan
Board Error Detection Circuit at No
Load]if not windy.
c. After checking [8-10-9 Checking the
Fan Board for Damage at No
Load], and there is no problem,
change Fan board.
d. If replacing Fan board doesn't re-
solve issue, change fan motor.
a. Check for disconnection of fan in-
verter output wiring and for broken
wiring.
b. If the error is not associated with any
of the items above, replace the 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 [8-10-7 Checking the Fan
Motor for Ground Fault and Coil
Resistance Problems] and [8-10-8
Checking the Fan Board Error De-
tection Circuit at No Load]. If no
problem, then check wiring forshort
circuit.
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 [8-10-
8 Checking the Fan Board Error
Detection Circuit at No Load]
b. After checking [8-10-9 Checking the
Fan Board for Damage at No
Load], and there is no problem,
change Fan board.
c. If replacing Fan board doesn't re-
solve issue, change fan motor.
BS_08_E