Cause of error code STA8

Burner on
Circulator off

Solution for error code STA8

Domestic Hot Water (DHW) Priority Forcing Circulator Off
When there is a DHW heat request wired to the Control’s DHW terminal the System Circulator will be “forced off” for the duration of the DHW heat request.  When the DHW heat request ends the System Circulator “force off” is removed, the circulator can respond normally.  When the Priority Time, (PT_) Parameter is set to “off” the System Circulator is not “forced off” for a DHW call for heat.  

Wiring / Circulator Issue:
Check wiring for loose connection, miswiring
Check circulator