Error Code [4121]; Error Code [4124] - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-4 Error Code [4114]
1. Error code definition
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
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- chapter 7
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.
BS_07_E