Mitsubishi Electric PURY-P72 Service Handbook page 217

[ IX Troubleshooting ]
1. Error Code
4240 (THMU-A)
Overload protection
2. Error definition and error detection method
If the output current of "(Iac) >Imax (Arms)" or "THHS > TOL" is continuously detected for 10 minutes or more during inverter
operation.
Model
P72 model
P96, P120 model
Model
P72 model
P96, P120 model
3. Cause, check method and remedy
Cause
(1) Air passage blockage
(2) Power supply environment
(3) Inverter failure
(4) Current sensor (ACCT) failure
(5) Compressor failure
Refer to section -7- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 293)
HWE0803A
Imax(Arms)
35
53
TOL
95°C [203°F]
80°C [175°F]
Check that the heat sink cooling air passage is not blocked
Power supply voltage is 188 V or above.
Refer to IX [4] -7-.(page 293)
Refer to IX [4] -7- (4).
Check that the compressor has not overheated during operation.
-> Check the refrigerant circuit (oil return section).
Refer to IX [4] -7- (2) [2].(page 295)
- 208 -
Check method and remedy
GB