Error Code [4240] (Tlmu) - Mitsubishi Electric R410A Service Handbook

[7-5 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-5-20

Error Code [4240] (TLMU)

1. Error code definition
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 during inverter operation.
Refer to the relevant pages for the details of model names and the specified values. [7-1-1 Inverter Protection Level Ta-
ble](page 155)
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
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems (TLMU)](page 264)
HWE14080
Check method and remedy
Check that the heat sink cooling air passage is not blocked
Power supply voltage is 188 V or above.
Refer to the following page(s). [8-9 Troubleshooting Inverter Problems
(TLMU)](page 264)
Refer to the following page(s). [8-9-13 Simple Check on Inverter Circuit
Components](page 272)
Check that the compressor has not overheated during operation.
Check the refrigerant circuit (oil return section).
Refer to the following page(s). [8-9-3 Checking the Compressor for
Ground Fault and Coil Resistance Problems](page 266)
- 183 - GB