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My Armstrong model # GUJ100D12-3A just stopped working. The blower seems to work, but cold air just comes out. The Temperature in the house was 41 degrees, but I had the thermostat on 60 degrees. What could the problem be? I thought maybe the pressure switch? Can you help me figure out what is wrong?

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Toget proper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV.If it's with heatingelement check power to element. If power is there but still no heat meanselement defective. Replace new heating element. Thanks.

Posted on Jan 03, 2011

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