Mitsubishi Electric PEFV-P72NMHSU-E Technical & Service Manual page 30

1. Error Code
4255
IPM error (Indoor unit)
2. Error definition and error detection method
IPM error signal is detected.
3. Cause, check method and remedy
Cause
(1) Power supply environment
(2) Static pressure setting error
(3) Inverter failure or fan motor error 1)
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
4255
Instantaneous overcurrent (Indoor unit)
Overcurrent (Indoor unit)
2. Error definition and error detection method
Overcurrent 18 Arms and above is detected by the current sensor.
3. Cause, check method and remedy
Cause
(1) Power supply environment
(2) Static pressure setting error
(3) Inverter failure or fan motor error
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
HWE1017B
Check method and remedy
Check the power supply voltage.
Check whether the power voltage is 176V or above across all phases.
Check that the static pressure setting and the design static pressure
are correct.
Refer to [8] 3.2.[1].(page 48)
2) Refer to [8] 3.2.[2].(page 48)
3) Refer to [8] 3.2.[3].(page 49)
4) Refer to [8] 3.2.[4].(page 49)
Check method and remedy
Check the power supply voltage.
Check whether the power voltage is 176V or above across all
phases.
Check that the static pressure setting and the design static pres-
sure are correct.
1) Refer to [8] 3.2.[1].(page 48)
2) Refer to [8] 3.2.[2].(page 48)
3) Refer to [8] 3.2.[3].(page 49)
4) Refer to [8] 3.2.[4].(page 49)
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