To Next PageTo Next PageWhat does it mean when my Burnham Apex APX399 Boiler has lockout number 9 DHW sensor fault?
Lockout Number 9 on your Burnham Boiler indicates a Domestic Hot Water (DHW) sensor fault, meaning there's a shorted or open DHW temperature sensor. Check for shorted or mis-wired DHW sensor wiring.
What does it mean when my Burnham Boiler has lockout number 8 Supply sensor fault?
Lockout Number 8 on your Burnham Boiler indicates a supply sensor fault, meaning there's a shorted or open supply temperature sensor. Check for shorted or mis-wired supply sensor wiring.
What does it mean when my Burnham Apex APX399 has lockout number 7 Return sensor fault?
Lockout Number 7 on your Burnham Boiler indicates a return sensor fault, meaning there's a shorted or open return temperature sensor. Check for shorted or mis-wired return sensor wiring.
What does it mean when my Burnham Apex APX399 Boiler has lockout number 14 DT inlet/outlet high?
Lockout Number 14 on your Burnham Boiler indicates a high temperature difference between the inlet and outlet, meaning the temperature rise between supply and return is too high. This is often caused by inadequate boiler water flow.
What does it mean when my Burnham Apex APX399 has lockout number 2 Boiler Safety Limit Open?
Lockout Number 2 on your Burnham Boiler indicates the Boiler Safety Limit is open. This is caused by the Boiler Safety Limit wired to terminals J6-1, 2 or 3 OPEN. Check for loose wiring to the limit device.
What does it mean when my Burnham Apex APX399 Boiler has lockout number 11 ignition failure?
Lockout Number 11 on your Burnham Boiler indicates an ignition failure due to flame failure after 5 restart attempts. This is often caused by no gas pressure.
What to do if my home is cold during cold weather days with my Burnham Apex APX399?
If your home is cold during cold weather days while using your Burnham Boiler, increase the High Boiler Water Temperature parameter 5°F per day.
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