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Fan continues to run after heating

Dayton Furnace: Fan continues to run after heating cycle has finished or reached room temp.

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That's the fan switch. It's a thermostat that controls the fan coming on and off, it's probably failed and needs to be replaced. You can see it if you take the front off the furnace, the wires come off it and go to the fan motor.

Posted on Jul 13, 2009

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Trouble shoot Dayton gas furnace model GG9S100C16MP11A fan is left on constant but in cold weather 10 or colder fan will go off and furnace will go thru a restart mode and run fine for awhile then will do...


Do not run contentiously during heat mode. the fan runs at a slower speed with heat and heat fires first then the fan cycles on during heat cycle then when heat satisfies the thermostat the heat will cycle off and fan will run for a couple more minutes and then cycle off. So set stat on fan cycle to auto.

Feb 03, 2015 | Dayton Gas Furnace Heater

2 Answers

Is it normal for my furnace to have burner cycle once or twice


That sounds normal. When the bonnet reaches a preset temperature the burner turns off then when it cools down a bit the burner turns back on. Clean filters etc will help to keep the burner on longer in a cycle.

Aug 24, 2014 | Heating & Cooling

1 Answer

Qmark muh won't shut off


I believe these models have a thermal switch on or near the heating element that normally runs the fan until the element has cooled. Similar to your home furnace. If the fan never shuts off this switch is likely bad. IF it takes a long time to shut off then it may be out of calibration. In either case they are non repairable parts and have to be replaced. If the heater is in a high spot resulting in a high ambient temperature it may take a while for the fan to shut down.

Dec 20, 2011 | QMark MUH (0521) Compact Heater

1 Answer

Fan runs long after room reaches desired temp. heat goes off and fan continues to blow cold air, have a protech 520 thermostat


Is your 'Heater' you are talking about-- A furnace-- with a burner and a blower?

Either way-- We need to adjust a control that determines WHEN THE FAN RUNS--

Most furnaces have a section where the heated air collects, and there has to be a sensor in that chamber, that senses when that air is warm enough to circulate around--- and when the burner shuts off, the air in that area cools down, and the sensor should shut off the fan-

Can you find the Heated air area?-- and can you find a temperature control in that area?-- Can you adjust the control, so that it shuts off the fan when the air temp drops to 100- to 120 degrees F...

Tell us more about the type of furnace/heater we are workig with, so I can better help you-

Tell us more

Mack B

Jan 18, 2011 | Heating & Cooling

1 Answer

I have a dayton hanging furnace that after a few minutes the fan stops and burner keeps burning then a few minutes later the fan starts again and keeps repeating this cycle. model 3E845. thanks.


On the side of the heat exchanger is a fan Klixon that turns that motor on when the temp exceed 110f on the side of the heater. maybe that thang is going out or your fan motor needs oiling and is cutting out on overload. Next to the fan klixon is usually a limit. Both look the same. The fan klixon will have a marking stamped into the metal such as F-120 the limit will have L-240.

Dec 28, 2010 | Dayton Gas Furnace Heater

1 Answer

Furnace fires up and heats to desired heat setting and burner shuts down , but the main blower continues to run on.


its the fan control AFC not shutting off , it comes on at temp rise say 150f drops back to 130f with fan on , burner shuts off fan runs untill temp falls to 100f the fan shuts off in this case it keeps running

Nov 13, 2010 | Dayton Gas Furnace Heater

2 Answers

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

1 Answer

My Dayton garage heater model 2E636B does not heat up.


These heaters are the same as the marley heater, the element never gets red hot. the unit is set up so the fan kicks on after the element has heated to a certain temp and turns off after the element has cooled. It is common for these heater fans to cycle on and off quite often untill the air temp reaches about 55 degrees and then will operate normaly. If the fan still cycles too often you may have to replace the fan control and high limit switch. These are not very expensive and easy to replace yourself. they arte usualy attached to the back of the element with clips. The luke warm air is what these units put out. I have an equivelent to the dayton G73 and it heats a 24' X 30' garrage all winter in central Minnesota.

Nov 17, 2008 | Dayton G73 Utility Heater

1 Answer

Dayton blower fan repeatedly kicks on and off


chech the air filter is clean and the fan limit switch look to change fan limit

Nov 01, 2008 | Dayton Gas Furnace Heater

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