My broiler runs about 5 minutes then stops been doing this all day its not responding to themostat.Making house very hot have to shut dow by electrical switch.HELP eatting up my heating oil

 

Is it your tstat that runs the pump or the burner?? Is it the temp control on the boiler that turns the burner on and off?????????info info ED

 

If your "broiler" keeps running I think your steaks are done by now..heehee

 

If you have one zone or zones using circulators look to the flow check for the unwanted circulation. Can you identify the flow check? If not we can describe it for you. Try turning the heat up and down a few times. Even though it is hot, if you start the circulator, it may dislodge the flow check and get things back to normal.

 

If you have a tankless water heater it requires a minimum boiler water temperature...the delta T is about 25F I believe, you might not be getting to the higher temp and it cuts off early. You need to figure why it is firing, and then should it be firing. Do you have a volt meter? with the watertank up to temp and all thermostats off, is it still firing? what is the boiler temp? What is the aquastat set to? Does it have a differential adjustment? Some don't.
Do you have a T,T ,F,F terminal strip on the primary control, on the oil burner ( a box like control on top of the motor, the F,F terminals will have yellow wires ), I'm assuming you have a cad cell relay(common style) oil burner. Put a meter across the T,T terminals, this will tell you that a control is telling it to fire. This is low voltage 24 volt. While its firing, remove the wires from under the screw of one, of the two, T terminals, on the primary control, it should stop, if it doesn't, the primary control is defective. If it stops, touch one wire at a time to see which one is calling, and trace it out.