Coleman mobile home furnace...Model number DGAA077BDTB...blows it's 20 amp fuse.
I have a Coleman mobile home furnace...Model number DGAA077BDTB. The furnace one went out, but we were able to reset the switch. Now the 20 amp fuse that the furnace is on blows occasionally. We're having some pretty cold weather. Could the furnace have some kind of surge when it kicks on that trips blows these fuses? There is only the furnace, an alarm clock, and room light on the same breaker.
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The control fuses keep blowing tells me one or more of the control that operate the control on 24 volts is malfuctioning. Most controls operate at about 5 watts and on a clamp on amp meter normally pull about 0.2 amp (p = current x voltage, 5 watts = 0.2 amps x 25 volts) I install 75 watt 24 volt transformer with a resettable overload to save on fuses. I reset the transformer and quickly go to the controls and determine the amp draw. When I find the one >0.2 amps I found the problem. The things to check is the emergency heat sequencer, fan control sequencer, reversing valve for heat pumps, main contactor on the condensing unit and any other 24 volt control loads. I have had to replace the themostat wire because the increase current for the thermostat wire can cause the entire length of wire to form a long heater and cause insulation degradationa and cause the thermostat wire to short out and blow the fuses.
Hope this helps
This can be caused be either a short in the wiring, loose connection on the board,or a low voltage connection not secure on the board. Check all connections to make sure they are tight and secure. Let me know what you find.
Is this a blend air system? If so, there is an upper & lower control board that communicate to each other, and if the exhaust fan on the roof is out, it will give you intermittent issues. The fan mixes or blends outside air with the return of the air handler, & duals to pressurize the attic. These were installed due to mobile homes built too air tight. Without this fan, your roofing shingles will curl, and your roof decking will bow prematurely.