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baxisystem 30/80se?

boiler fires ok and runs for about 15 minutes,then starts knocking itself on and off,and then might stay off 20 minutes. Changed 3 stats but still the same problem ?.
ALAN, February 2011
pcb board should do it

ron, February 2011
Yes 1 thermistor plus a high limit return thermostat

ALAN, February 2011
when you say stats do you mean thermistors?

triffid, February 2011