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My dayton NG heater fan will not shut off properly

My Dayton natural gas garage heater heater fan will not shut off properly after flame shut down and the unit has cooled.  If left alone with only the pilot flame lit, the fan will randomly come on and stay on indefinitely. I just bought and installed the unit and wired-in a new battery operated thermostat.

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Sounds like a bad fan switch. The switch is located on the heat exchanger and is 110 volt bi-metal switch. Follow the wires from the blower going back to the heatexchanger. Graingers can get you a new switch if you give them your model number.

Posted on Dec 12, 2009


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How to Convert to NG

You have to contact the manufacturers rep in the community to verify that the particular model of Dayton heater has the capability of NG to LP conversion. If it is, the natural gas kit will include a new set of brass 'spuds'...typically referred to as 'orifices'....for the main burners. The size of the hole will be considerably larger because NG contains less btu per cubic foot than LP gas.

There will be a replacement pilot orifice for the pilot assembly. Removed and installed usually a 1/2" and 7/16" wrench. This orifice will also have a larger diameter opening.

There should be a regulator to match the 100% redundant gas valve that is in your heater. Note though, that there may be several regulators in the kit to match any one of several brand gas valves that could've been installed on your heater....Robt Shaw, White Rodgers, Honeywell. They will NOT interchange with one another. Follow the directions closely to ensure installation is done are working with a volitile, explosive gas !!!!

There may or may not be a set of air shutters to fit over the ends of the burners for primary air adjustment. Natural gas may require a bit of air adjustment to get the proper flame.

Thoroughly leak test everything when done, then leak test again.
If you feel you are in over your head, you probably are so contact a reliable service organization to do it instead. But at least you now have an idea of what is involved.

Aug 21, 2014 | Dayton (4LX45) Gas Heater

1 Answer

Dayton gas furnace model 3e385 works and lights but as soon as fan comes on the unit shuts off and lights again wondering what was wrong

Check heat exchanger for cracks or holes which will cause the fan to blow out the flames. The flame sensor on the pilot or burners has to be in constant contact with flame to operate normally. If the flame is put out by a cracked exchanger the exchanger or furnace needs to be replaced.

Nov 22, 2011 | Dayton Gas Furnace Heater

1 Answer

Model #3e243b Dayton heater chg from LP to NG

Dayton is primarily sold by . You must purchase a re-jetting kit (Natural Gas Valve) from them to accomplish this.

Grainger Part # natural-gas-valve-1fek5_as01.jpg view_larger_button.gif Natural Gas Valve
Item # 1FEK5
Natural Gas Valve, For Use With 5VD61, 5VD63, 5VD65 DAYTON
1FEK5 4401 Usually ships
1-3 Days 1 $144.30 item_sale_symbol.gifSale Price$115.44 See All: Parts

Sep 23, 2011 | Dayton (3E379) Heater

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I have a 75k BTU Dayton hanging gas heater that the fan comes on intermittently. The flame will shut down and try again, then the fan will come on.

This problem is caused by a bad flame sensor (looks like a spark plug) which can be cleaned by sanding or with steel wool.

Dec 02, 2010 | Dayton Gas Furnace Heater

1 Answer


The heater is not proving the flame...and shutting down on safety...
Check the flame sensor and all connections of the ground from the burner to the ignition control...
The control may also be bad...
for additional help with Dayton units go to
they sell that brand and have their own repair help techs.


Sep 17, 2010 | Dayton (2NH04502025) Heater

1 Answer

Have 30,000 btu Dayton heater m#3e3665 when reaches temp. fan

Hi blow heater out with air line flame sensor could be dirty check out pressure switch jump this out see if it lights

Feb 09, 2010 | Dayton (3E379) Heater

1 Answer

Furnace flame goes low fan stays on

if the gas pressure is good on inlet and outlet of valve u might wanna chk the burner trays and manifold for flakes, dirt, spider webs ect... once u kno the passages are clear from obstruction you can focus on the mechanical. (sounds like gas valve may be getting weak and not able to open fully)

Mar 21, 2009 | Dayton Gas Furnace Heater

1 Answer

Flames burn then die down

it sounds like you may have a dirty pilot tube or a weak pressure regulator. I would try blowing out the pilot tube to make sure it is clear and if that does not work then replace the regulator.

Feb 14, 2009 | Dayton Gas Furnace Heater

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