Question about Dometic Rooftop RV Air Conditioner

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A/c runs and cools but will not shut off also furnace willnot startup thanks barney

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Check for faulty thermostat

Posted on Nov 16, 2008

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I cannot get the thermostat to allow the furnace to shut off. heater runs non-stop.


There should be a switch on your wall by the thermostat or on the furnace itself. Shut if of with that and get someone in to check out the furnace.

Jan 25, 2017 | Heating & Cooling

1 Answer

After furnace shuts off fan keeps running and blows cool air for while before shuting off


Check the AFC AUTOMATIC FAN CONTROL is not blocked with fluffon the back of it , you can remove this and check the back of it .

Mar 15, 2013 | Heating & Cooling

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Trane XR80 Furnace won't stay running


It sounds like your flue work in your main problem get this fixed first then see how it runs , pipes should run all the way out of the chimney .

Jan 23, 2013 | Heating & Cooling

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Draft fan keeps on running after furnace shuts


That sounds pretty normal for most furnace/heater products. They run the heating element with fan for a cycle then after the heater reaches temperature it will shut off and the fan will continue to run to cool the element and to circulate the heat that it produced. If you want the manual for this product it looks like you can get it here: http://homeappliance.manualsonline.com/ex/product/headline/m/Coleman%2BEvcon/d/furnace/p/DGATO75BDC

Oct 26, 2009 | Coleman 10' X 10' Sundome Tent 9160K101

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Coleman gas furnace. Burner will re-fire for a few seconds during the cooldown. Model G8C07512MUB12A


This is a little complicated because it can be several things and you need to provide more specific info....It could be your furnace is shutting off on the High Limit...which means your furnace is running too hot...check the filter , return air vents etc would be an airflow problem...dirty blower....Furnace can be too big for your house....when the furnace shuts off on High LImit , the fan will continue to blow air , cooling it down as usual and once the furnace cools enough to reset the high limit trhe furnace will Ignite again as long as the thermostat is still calling for heat . The furnace could also be running too long and getting too hot....your Ductwork can be too small...many factors come into play

Oct 25, 2009 | Heating & Cooling

1 Answer

Red light blinks 4 times, will only cycle once


the high limit is sensing the internal temprature of the furnace.If your filter is very dirty or you have to many of the registers/dampers shut it will cause the temp. of the furnace to exceed its rating and the high limit will open the circuit and shut down the flow of gas. Your blower will then run until the furnace has cooled and the switch will close and allow it to come back on. This is bad for your furnace, make sure your filter is clean and you dont have to many registers shut. If you have run the unit without a filter the problem could be much more sever requiring blower wheel and coil cleaning and possibly a cracked heat exchanger.

Sep 12, 2009 | Goodman GMS90703BXA Heater

1 Answer

Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.

Mar 11, 2009 | Carrier Heating & Cooling

1 Answer

Furnace starts properly, then shuts down, led flashes 8 times


The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.

Jan 10, 2009 | Goodman GMS90703BXA Heater

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