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1972 duo therm mobile home f urnace hugh 1-3-12  
I cant get the blower to work in winter mode. the furnace lights up the thermast is set at its highest but when the tempature gets high enough the blower wont blow
Re: 1972 duo therm mobile home f urnace Keith 1-3-12  
Hi Hugh, you might want to try mobilehomerepair.com, they have a forum for MH furnaces. Good luck
Re: 1972 duo therm mobile home f urnace BUBBA THE BUS TECH 1-3-12  
These furnaces have what is called a low limit or blower cut in switch.
It is a simple temperature switch that cut in the fan when the heat exchanger gets hot enough.
It will be a little silver button with two wires. Conecting the two wires together should start the blower motor.
There will be an Identical in aperance switch that is the high limit and will turn off the gas so the furnace does not over heat. Hot wiring this one only makes the flame burn.
Good Luck
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