15 year old oil fired external boiler has just stopped working. The overheat button is out but will not reset. There is no red light on the burner but it runs when I switch the test switch on. Can anyone point me in the direction of what the problem may be please? Can I leave the test switch in the on position in this emergency?
Thanks in advance.
Model is 60/70 if that makes sense.
Thanks in advance.
Model is 60/70 if that makes sense.