Question about Dayton (3E379) Heater

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No fan burner starts and heats up but fan does not come on then burner shuts off because heat exchanger is heated up furnace has been sitting for a while

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Their may be several problems here. 1. The Thermostatic fan control in the furnace may be bad or.. 2. The fan motor could be defective or.. 3. The circuit board which controls all operations of the furnace could have burned out or.. 4. The blower compartment door is not closed completely.

Think with me Kiki.. If you have removed the blower door to replace filters lately, then #4 is most likely. There is a button that will be depressed when that door is closed correctly. It is very sensitive, and very common to your problem. Make sure the door contacts this switch/button. A schematic of the furnace can be found on the back of this door. If you need more advice get back to me.

Ray


Posted on Dec 07, 2008

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Posted on Jan 02, 2017

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My furnace is a Rheem has issues of pilot light not staying lite the flame blows out won't stay on long enough to heat house


First thing I do, especially if the furnace is an older one, is to light a match or long end lighter(like for BBQ pits), hold it inside the opening on the front of the furnace heat exchanger, where you would normally see the burner flames, then turn on the fan only. If you see the "flame dance/flame disturbance", then that furnace may be unsafe due to a cracked heat exchanger. Holes or cracks in heat exchanger will blow out the pilot by allowing the air that we breathe to enter the heat exchanger and mix with the combustion process. AND may cause carbon monoxide poisoning. In that scenario, I would call in a professional. Now if it's not a heat exchanger issue, the flue pipe may have a back draft issue. Again, call a professional! Play it safe with that issue. Hope this helps!

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Make sure you give it time. Gas furnaces ignite first and then the fan comes on. It will run for a while to heat the exchanger first. If the fan comes on with the heat it will blow cold initially. The fan also continues to run after the burners shut off to expel the existing heat in the ductwork

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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.

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if the pilot goes out before the fan comes on then your heat exchanger is plugged . if it goes out when the fan comes on then you may have a cracked heat exchanger. it also could be dirty burners with a delay. is there nd slight poping on igintion see if cross overs on the burners are dirty

Nov 25, 2010 | Heating & Cooling

1 Answer

I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Heating & Cooling

1 Answer

Heater kicks on and off after heating.


The blower may cycle on and off to cool the heat exchanger. The fan limit still senses the heat after the furnace shuts off and the limit goes up the same as when the furnace first starts. You could adjust the settings on the fan limit.

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1 Answer

Weatherking furnace is starting and stopping


This just sounds like a couple of problems. First, your blower is designed to only turn on once the heat exchanger heats up, so the flame will be on for a minute or two before the blower starts. it sounds like your blower is cooling down the heat exchanger too fast and causing it to shut off so it can warm up again...check blower speed for heat, it should be the lowest speed (black wire). Blue=medium speed, red= high speed. second problem could be your flame sensor rod is calcified, you just need to locate this and clean it off with some fine sand paper.it is located in the flames near the burners. Also change your filters, for proper air flow through your heat exchanger.

Oct 28, 2009 | Heating & Cooling

2 Answers

My heater will kick on right away but after 3-5mins it stops producing heat then a few mins later it will start heating again. Why?


The furnace could be shutting off on High Limit ...means your furnace is running too hot...check your filter and make sure return air vents are clean and clear....also it can be the Heat anticipator in your thermostat...which controls how many times your furnace cycles...basically your furnace should come on and off 5-6 times/hr ....need more info on your type of furnace and type of thermostat

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1 Answer

A 1979 Colman RV furnace. Blower shuts off shortly after burner shuts off leaving a hot heat exchanger. After 15 seconds blower comes on again blows for 10 seconds shuts off comes on in 15 seconds blows...


The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

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