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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Pilot and burner light then gas shut off model 7900


How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.

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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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1 Answer

Ruud Silhouette II Gas Furnace, purges, lights burners and burns until the blower starts and then burner stops and does not really blow very warm air. Once blower shuts off, it starts the process all over...


I would be looking at the heat exchanger. They are designed to have the heat from burnt fuel flow thru them. Cracking or pin holes will let the super heated air into the furnace interior and in there you have some over heating protection some look like buttons, older they look like an external thermostat, and these get the hot gas from the burners and trip then the furnace shuts down. When the furnace comes on again some times the blower will come right on because the sensor says hey this thing is hot when in fact it isn't. This also can and if bad enough will cause carbon monoxide poisoning, please inspect this closely or have a professional look at this. There is no price ever to great to replace a human life.Sorry probably not the answer you wanted but better safe than sorry!

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1 Answer

Have a miller furnace. and when i light the pilot, and turn on the furnace. the combustion chamber comes on. it blows out the pilot whats the issue please help no heat.


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

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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

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1 Answer

When furnace runs blower won't run.as soon as furnace stops blower runs. They never both run.


Sounds like fan limit switch/fan timer

This will cause the main burner to run untill the over tempreture switch is tripped therefore shuting gas supply and running fan on high till over heat condition is resolved then it will restart burner and repeat
continuing to run heater like this will cause heat exchanger split.

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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.

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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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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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