Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 148

[ IX Troubleshooting ]
1. Error Code
4240
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
Imax(Arms)
50
HP72
HP96 53
TOH
Model
HP72, HP96 80°C[176°F]
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 - 6 - "Inverter" under part [4] "Trouble shooting principal parts" for error codes related to the
inverter.(page 196)
HWE0716A
Check method and remedy
Check that the heat sink cooling air passage is not blocked.
Power supply voltage is 180 V or above.
Refer to 9 [4] - 6 -.(page 196)
Refer to 9 [4] - 6 - (4).(page 201)
Check that the compressor has not overheated during operation.
-> Check the refrigerant circuit (oil return section).
Refer to 9 [4] - 6 - (2)[2].(page 198)
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GB