Cause of error code STA1

1.
Standby Burner off Circulator off

2.
Circulator
Pre-purge
Burner off
Circulator on

Solution for error code STA1

1. The boiler has not detected a call for heat (hr = off and dh = off).
Ensure there is power to the boiler control.

Check the thermostat:
-When a thermostat call for heat is detected boiler control display “hr” will show “on”
-Make sure thermostat is calling for heat and contacts (including appropriate zone controls) are closed.  Check for loose connection.

Check the DHW demand:
-When a domestic call for heat is detected boiler control display “dh” will show “on”
-Make sure the DHW aquastat contact is closed.  Check for loose connection.

2.The boiler is warm and circulator is providing residual boiler heat to building:
Check boiler temperature
-The boiler will not start until boiler water temperature is less than the Setpoint (SP) minus differential (df)
-If boiler water temperature is higher than Start Temperature (ST_, default = 140 F) and the Circulator Pre-purge (PP_, default = 2 minutes) time has not expired, boiler start will be delayed until water temperature drops or time expires.  To permit the boiler to start sooner increase Start Temperature parameter.  Refer to Operation Section for additional information.