warm flow boiler ?

So many things can go wrong with a oil burner. I think Warmflow use the Riello RDB burner. Could be the pump, the controller box, the spark unit/electrodes, the oil nozzle, the solenoid, the flame sensor and sometimes an incorrect air setting, all these things can cause the burner to lock out. Needs to be tested by someone that knows what they are doing. Riello parts are expensive, so can't change things willy nilly!!

Jason
March 2009