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If the switch has changed its color means it did burn out at one of the terminals. Yes, you can buy a new switch.
But if this is not the problem it can be that the thermostat is not working.
There are thermostats available.
But if the thermostat and the siwtch are not the problem it may be that the junction with the electrical resistance is burned up. This can also be replaced.
All items I found in Mexico City.
I do not think it is economically feasible to acquire the parts and replace them. Chinese made appliances or spare parts are not to be found for a good price and still are not reliable. Buying a new one is the solution, perhaps.
You can sand the flame sensor but it sounds like another problem. Sounds like a limit switch or something in the control circuit, You need to have a service tech look at this. Ask for free estimate on repair. I have worked on hundreds of these units and they are sometimes tricky to work on. Lenox has come up with new controls for the whisper heat furnace to replace the old ones. If the flame sensor is bad the unit will try to light a few times and lock out and you ahve to kull power to the furnace to reset. If this is whats happening clean the sensor nd you should be ok If not you need help from a service tech.Rus
colman uses the furnace to power the attic vent fan . Cheaper that way I guess. It just supplies your attic fan with power so it will vent thus keeping your home a little cooler in the summer. not a big deal. you can shut the alarm with a switch ot cut power to the alarm.
i went all over town looking for a switch. finally found two lighted switches at grainger carling technology part no. 1A824. ground down the outsides glued both together jumped across top and bottom terminal with copper wire and it seems to work fine now.only time will tell. i hate our throw away society which the junk imported in from china seems to foster.
Some of the newer models have a thermal fuse which may be blown. It doesn't look like a normal fuse at all. It is similar to a transistor in looks and should have continuity from one end to the other. It will be tied in to the incoming power cord inside the heater, and may be covered with rubber coating within the wire. It will look different when you notice it. Sometimes its too far down inside where the heat causes it to blow prematurely. The purpose is to cut the power to the unit in case it overheats. You can get one at radio shack for less than a couple of bucks. The older models don't normally have one, but I would suggest you put one in it if that's the case.