Riello 40 G3B burner intermittently trips out. this may be occurring at the end of a burn cycle and will therefore not start when the stat calls for heat again. The orange reset button has to be pressed to get it started again
either
photo cell needs cleaning or circulation pump gone trips out high limit stat caused by exceessive heat build up,faulty themostatdirt in fuel clogging up burner
john, April 2009
Possibly motor capacitor faulty. could be blocked oil filter
