Mitsubishi Electric CMB-WM108V-AA Service Handbook page 152

[ VIII Troubleshooting ]
4106
1. Error Code
4106
<Transmission power supply fault Error detail code FF (Outdoor unit)>
2. Error definition and error detection method
Transmission power output failure
3. Cause
1) Wiring failure
2) Transmission power supply cannot output voltage because overcurrent was detected.
3) Voltage cannot be output due to transmission power supply problem.
4) Transmission voltage detection circuit failure
4. Check method and remedy
Check the items in VIII [4] -3- (2) Troubleshooting transmission power circuit of outdoor unit on all outdoor units in the same
refrigerant circuit.(page 195)
<Transmission power supply fault other than error detail code FF (Outdoor unit)>
2. Error definition and error detection method
Transmission power reception failure
3. Cause
One of the outdoor units stopped supplying power, but no other outdoor units start supplying power.
4. Check method and remedy
Check the items in VIII [4] -3- (2) Troubleshooting transmission power circuit of outdoor unit on all outdoor units in the same
refrigerant circuit.(page 195)
1. Error Code
4114
Indoor unit fan motor error
2. Error definition and error detection method
When the fan motor output from the indoor unit circuit board is ON and when the rotation speed input from the fan motor cannot
be detected for 30 seconds or more
3. Cause, check method and remedy
Cause
(1) Fan motor connector contact failure
(2) Indoor unit circuit board failure
(3) Fan motor fault
HWE1708A
Check method and remedy
Check the fan motor connector CNMF for proper connection.
Remove the fan motor connector CNMF and check the voltage at the
indoor unit circuit board.
Testing point 1. 280 VDC (Between CNMF1 (+) and CNMF4 (-))
2. 15 VDC (Between CNMF5 (+) and CNMF4 (-))
Replace the indoor unit circuit board if the voltage is abnormal.
If the 4114 error persists after the indoor unit circuit board is replaced,
replace the fan motor as well.
Replace the fan motor if the voltage is normal in step (2) above.
If the 4114 error persists after the fan motor is replaced, replace the in-
door unit circuit board as well.
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GB