Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 276

[ IX Troubleshooting ]
1. Error Code
4250
Short-circuited IPM/Ground fault (Detail code 104)
2. Error definition and error detection method
When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter.
3. Cause, check method and remedy
(1) Grounding fault compressor
(2) Inverter output related
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
1. Error Code
4250
Overcurrent error due to short-circuited motor (Detail code 105)
2. Error definition and error detection method
When a short is detected on the load side just before starting the inverter operation.
3. Cause, Check method and remedy
(1) Short - circuited compressor
(2) Output wiring
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
1. Error Code
4260
Heatsink overheat protection at startup
2. Error definition and error detection method
The heatsink temperature (THHS) remains at or above TOH minutes or more at inverter startup.
Model
PQHY
PQRY
3. Cause, check method and remedy
Same as 4230 error
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
HWE15150
Cause
Cause
TOH
105°C [221°F]
100°C [212°F]
- 267 -
Check method and remedy
Refer to IX [4] -6- (2) [2].
Refer to IX [4] -6- (2) [1]-[5].
Check method and remedy
Refer to IX [4] -6- (2) [2].
Check for a short circuit.
GB