Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 219

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
[HBC]
Cause
(1) Pump INV board failure
(2) Pump failure
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
7-6-29 Error Code [4250] Detail Code 121, 128, and 122
1. Error code definition
DCL overcurrent error (H/W) (Detail code 121 and 128)(outdoor unit) DCL overcurrent error (S/W) (Detail code 122)
(outdoor unit)
2. Error definition and error detection method
When a DCL overcurrent is detected by the electric current sensor
3. Cause, check method and remedy
Cause
(1) Inverter-output-related
items
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
46
- chapter 7
Check method and remedy
Refer to the following page(s).
[8-10-12 Checking the Error-Detection Circuit on the Pump INV Board (Without
load)]
[8-10-13 Checking the Pump INV Board for Damage (Without load)]
[8-10-14 Checking the Pump INV Board for Damage (During pump operation)]
Check the outdoor unit pump for proper operation.
Check the pump motor if problems are found with the operation of the pump.
Refer to the following page(s).
[8-9-4 Water Pump Control]
[8-10-11 Checking the Pump Motor for Ground Fault and Coil Resistance Prob-
lems]
Check method and remedy
Refer to the following page(s). [8-10-2 Checking the Inverter Board Error Detection
Circuit]
Refer to the following page(s). [8-10-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems]
Refer to the following page(s). [8-10-4 Checking the Inverter for Damage at No-
Load]
Refer to the following page(s). [8-10-5 Checking the Inverter for Damage during
Compressor Operation]
Refer to the following page(s). [8-10-15 Checking the Installation Conditions]
BS_07_M