I have a Beckett burner probably 15-20 years old. It is acting strangely.... It is tripping the relay and popping the red button. When the boiler is cold, I press the red button (there is already a demand for heat) and the burner starts and runs very smoothly for about 15-20 minutes. The boiler temp is about 180 degrees. The circulators come on and I have heat to the baseboards. After this time the burner just cuts out and trips the safety relay. I wait and press the red button again. The burner fires up but most times it is not running smoothly and trips out again after a few seconds (about 15) It seems that the burner when at temp in the boiler cuts out and trips the relay. There is still 120VAC to theburner motor from the aquastat. I have replaced the filters, nozzle, electrodes, set electrodes via beckett tool, checked the fuel pump for proper flow, bled fuel lines, tested transformer, replaced CAd Sensor and relay. The motor turns smoothly. I am really at wits end with this! Could it be the motor cutting out at boiler temp? Thanks

Chad It sounds like you're on the right path. It does sound like the zone is air bound. Pictures would help. Hopefully, there was some type of purge station set up. Has that zone worked since the new boiler was installed?