I just replaced the fuel control box on my Intertherm furnace for my mobile home and it was working fine earlier and now the heat won't come on and the thermometer is set high. When I checked it earlier, the blower was not turning and it would only turn on every so often. We have not used this heater for all most 4 years, could it be that it needs to be cleaned or replaced?

Fuel control box? Sorry I don't know what you mean. Is this furnace gas or oil? A model number might help.