On Feb 13, 8:50*pm, (Dick Adams) wrote:
I have an oil furnace with an oil hot water heater.
It has shut off 4 times in the last week in spite
of there being over 100 gallons of oil in the tank.
All I've had to do is to click a switch on its
electrical box and it comes back on.

Other than someone hitting the emergency shutoff
switch, what should I be looking for?

Dick

If its a reset switch, it could be the photo flame sensor is sensing
there is no flame. It could be dirty as the other poster said.