Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 151

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-8 Error Codes [4220, 4225, 4226] Detail Code 111, 112
1. Error code definition
Logic error (Detail code 111, 112)
2. Error definition and error detection method
Hardware error
If only the hardware error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
In the case of 4220
Cause
(1) External noise
(2) INV board failure
In the case of 4225 and 4226
Cause
(1) External noise
(2) Fan board failure
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
7-6-9 Error Code [4220] Detail Code 123
1. Error code definition
Voltage boost control error (Detail code 123)(outdoor unit)
2. Error definition and error detection method
When a drop in power supply voltage or a malfunction in the booster circuit is detected
3. Cause, check method and remedy
Cause
(1) Inverter-output-related
items
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
18
- chapter 7
Check method and remedy
Refer to the following page(s). [8-9-2 Checking the Inverter Board Error Detection
Circuit]
Check method and remedy
Refer to the following page(s).
[8-9-8 Checking the Fan Board Error Detection Circuit at No Load]
[8-9-9 Checking the Fan Board for Damage at No Load]
[8-9-10 Checking the Fan Board for Damage with Load]
Check method and remedy
Refer to the following page(s). [8-9-2 Checking the Inverter Board Error Detection
Circuit]
Refer to the following page(s). [8-9-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems]
Refer to the following page(s). [8-9-4 Checking the Inverter for Damage at No-Load]
Refer to the following page(s). [8-9-5 Checking the Inverter for Damage during Com-
pressor Operation]
Refer to the following page(s). [8-9-11 Checking the Installation Conditions]
BS_07_C