All of a sudden my Mistral Heat Zone heater will not work; I turn it on and no heat comes out... what can I do to fix it?
The water level is fine in the container on the side of the heater, the lights turn on, but after even an hour of time, absolutely no heat comes out?
Please help! I know I don't need to ever fill / replace the oil in the radiator but why else would it not be working/heating???

Belinda, March 2011