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Error code check
Error number
Errors
77
Fan over voltage
(771)
error
n Failure diagnosis method
Is a product installation
status normal?
Yes
Is insulation resistance
between motor output
Yes
Is a motor wire connection
status normal?
Yes
Is a fan board normal?
Yes
Power and installation
environment recheck
Meaning
In case where output cur-
rent is flow more than 5A
Confirm fan motor assembly status restriction → Fan motor
No
re-assembly and replacement when finding a problem
1. Confirm resistance between motor output terminal (U,V,W) lines
- Panasonic motor : 9.5 Ω ± 5 % (Based on 25 ℃)
No
2. Insulation between a motor output terminal (U,V,W) and a pipe
Resistance confirmation (More than dozens MΩ )
→ Fan motor replacement when finding a problem
No
1. Confirm whether or not the color of motor output terminal
(U,V,W) connector is agreed
2. Confirm wire disconnection and connection → Re-assembly and
take action when finding a problem
No
Confirm whether or not the fan board IPM is normal → Fan board
replacement
Main cause of occurrence
1. Overload operation
2. Fan motor defect
3. Fan board defect
4. Fan motor connector insertion defect
5. Heat exchanger freezing or perfect shielding
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