To Next PageTo Next PageWhat does it mean when my Burnham Apex APX399 has lockout number 10 Stack sensor fault?
Lockout Number 10 on your Burnham Boiler indicates a stack sensor fault, meaning there's a shorted or open flue gas (stack) temperature sensor. Check for shorted or mis-wired stack sensor wiring.
What does it mean when my Burnham Apex APX399 Boiler has lockout number 23 24VAC voltage low/high?
Lockout Number 23 on your Burnham Boiler indicates that the 24VAC control power is either too high or too low. Check for a loose connection in the 24Vac VAC power wiring.
What does it mean when my Burnham Apex APX399 has lockout number 19 Purge rate proving failed?
Lockout Number 19 on your Burnham Boiler indicates that the purge rate proving failed. This means the blower isn't running at the purge rate when it should, or the blower speed signal isn't being detected. Check for a loose connection in the 120 VAC blower wiring.
What does it mean when my Burnham Apex APX399 Boiler has lockout number 18 Light off rate proving failed?
Lockout Number 18 on your Burnham Boiler indicates that the light-off rate proving failed. This means the blower isn't running at the light-off rate when it should, or the blower speed signal isn't being detected. Check for a loose connection in the 120 VAC blower wiring.
What does it mean when my Burnham Boiler has lockout number 15 Return temp higher than supply?
Lockout Number 15 on your Burnham Boiler indicates that the return temperature is higher than the supply temperature. The Control is reading a return sensor temperature higher than the supply sensor temperature. This is often caused by reversed flow through the boiler.
What does it mean when my Burnham Apex APX399 has lockout number 1 Anti Short Cycle?
Lockout Number 1 on your Burnham Boiler indicates an Anti Short Cycle, meaning the minimum time between starts has not been reached.
Why is my Burnham Apex APX399 blinking green power light on control?
A blinking green power light on the control of your Burnham Boiler indicates a control fault. Try disconnecting all terminals except 24VAC to power the control; the green light should then be steady.
What to do if my Burnham Boiler is running but the system or boiler circulator is not running?
If your Burnham Boiler is running, but the system or boiler circulator isn't, check the wiring for loose connections or miswiring. When there is a Domestic Hot Water Heat Request the System or Boiler pumps will be forced “off” when there “Run Pump for” parameter is set to “Central heat, off DHW demand” or “Central Heat, Optional Priority”. After one hour of “priority protection” or the end of the Domestic Hot Water Heat Request the system and boiler pumps will be free to run.
What does error code 00FF mean on my Burnham Apex APX399?
Error code 00FF on your Burnham Boiler indicates the display has lost communication with the control. This can be due to a loose or defective display harness, a defective display, or a defective control.
What to do if my home is cold during mild weather days with my Burnham Apex APX399?
If your home is cold during mild weather days while using your Burnham Boiler, increase the Low Boiler Water Temperature parameter 5°F per day.
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