Mitsubishi Electric PFAV-P250VM-E Service Manual page 149

[ X Troubleshooting ]
1. Error code
4109
Fan fault (indoor unit)
2. Error definition and error detection method
If the auxiliary relay X4 (fan fault detection) remains unexcited for a certain amount of time during operation, the unit will come
to an abnormal stop.
Overcurrent relay trip value
Model, Motor output
PFAV P250 2.2kW
P500 5.5kW
P750 7.5kW
P300-F 1.5kW
P600-F 2.2kW
P900-F 3.7kW
3. Cause, check method and remedy
Cause
(1) Overcurrent relay (51F) trip
(2) Blown fuse (F1)
(3) Auxiliary relay (X4) fault
(4) Broken wire
(5) Loose connector
(6) Indoor unit control board
(I.B.) fault
1. Error Code
4115
Power supply signal sync error
2. Error definition and error detection method
The frequency cannot be determined when the power is switched on.
3. Cause, check method and remedy
(1) Power supply error
(2) Noise filter problem
Coil problem
Circuit board failure
(3) Faulty wiring
(4) Wiring failure
Between noise filter CN3 and noise filter CN2 and con-
trol board CNAC
(5) Control board failure
HWE10190
Trip value
5A
11A
15A
3.6A
5A
7.5A
Check the fan for proper rotation. Check for worn bearings and pulley contacts.
Check the V-belt for proper tension. (Check for over-tightening.)
Check the motor for proper rotation.
51F malfunction (with the test switch being left to ON)
Check for blown or loose fuses.
Loose lead wire, broken wire, miswiring
Coil fault, contact failure
Check for broken wires.
Check the connectors for proper contact.
If the above items are all normal and the problem persists, circuit board failure is
suspected.
Cause
Check method and remedy
Check method and remedy
Check the voltage of the power supply terminal
block (TB1).
Check the coil connections.
Check for coil burnout.
Confirm that the voltage at the CN3 connector is
198 V or above.
Check fuse F01 on the control board.
Confirm that the voltage at the control board con-
nector CNAC is 198 V or above.
If none of the items described above is applicable,
and if the trouble reappears even after the power is
switched on again, replace the control board.
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