Mitsubishi Electric PURY-P72 Service Handbook page 235

[ IX Troubleshooting ]
4240
1. Error Code
4240 (TKMU-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, P144 models
Model
P72 model
P96, P120, P144 models
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 (TKMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 310)
HWE1116D
Imax(Arms)
28
50
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 310)
Refer to IX [4] -7- (5).(page 317)
Check that the compressor has not overheated during operation.
-> Check the refrigerant circuit (oil return section).
Refer to IX [4] -7- (2) [2].(page 312)
- 226 -
Check method and remedy
GB