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Heating  Heating

Brand

Triangle-tube Triangle-tube List all brands

Type:

Challenger Solo CC85s view Challenger Solo CC85s List all types

Error code:

E21
List all errors


Error code: E21

Cause of error code E21

 CH return  sensor fault S2 

Solution for error code E21

Check wiring for break
Check for proper flow direction 
Replace S2
Shorted sensor


 

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