Mitsubishi Electric PURY-P72 Service Handbook page 218

[ IX Troubleshooting ]
1. Error Code
4240 (YHMU-A)
Overload protection
2. Error definition and error detection method
If the output current of "(Iac) >Imax (Arms)" or "THHS > 95°C [203°F] " is continuously detected for 10 minutes or more during
inverter operation.
Model Imax(Arms)
P72 model
P96 , P120 model
3. Cause, check method and remedy
Cause
(1) Air passage blockage
(2) Power supply environment
(3) Inverter failure
(4) Compressor failure
Refer to section -7- "Inverter (YHMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 301)
HWE0803A
19
27
Check that the heat sink cooling air passage is not blocked
Power supply voltage is 414 V or above.
Refer to IX [4] -7-.(page 301)
Check that the compressor has not overheated during operation.
-> Check the refrigerant circuit (oil return section).
Refer to IX [4] -7- (2) [2].(page 303)
- 209 -
Check method and remedy
GB