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.  
-When there is DHW heat request and an Outdoor Air Reset IQ Card is installed the System Circulator will be forced off for the duration of the Reset Card’s Priority Time (PT_) parameter.  Check Priority Time (PT_    parameter using the Outdoor Air Reset IQ Option Card Adjustment Mode (see Reset Card Adjustment Mode Instructions).

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