The fan will run on for approx 1 minute after it has been turned off. This is to cool the unit down and clear any fumes or gas.
Are the burners shutting off because the room temperature is satisfied or are they turning off while there is still a demand for heat? You don't really explain what the issue is. Please walk me through exactly what it does when you turn it on.
As the person before me stated, the fan will run for a pre-determined ammount of time to cool the heat exchanger down.
Testimonial: "burners turn off BEFORE room temp is satisfied, fan keeps going for hours if i don't shut power and restart it"
SOURCE: Dayton 3E227A Heating Cycle
The sensor for the thermostat is probably going bad or has bad connections. It is (or thinks it is) heating up fast and therefore shuts of the heater.
SOURCE: Dayton gas heater mod 3E404
This is an easily fixed problem. There are two thermistor switches on Dayton furnaces. One controls the fan motor run function and the heater valve on/off function. The other called a blocked vent switch (located in the top front of the heater) stops the gas valve from opening in the event the
vent is plugged. However, if the furnace was totally shut down for the summer and is now being fired up for winter, the block vent switch has to be reset. The switch has a reset button on it, push it and it should solve your problem. Also, check to make sure the fan run thermistor is clean and does not have debris around it as that acts a insulator for heat to keep the fan run function on.
SOURCE: HEATER MAKING LOUD NOISES
Check the draft inducer motor for any partial blockages or dibri.
I've seen sticks, birds nest particles and pieces of deteriorating fan blades (squirrel cage type fans) cause this.
You might also find that the inducer motors bearing are going.
If its a loud vibrating grinding type noise, I'd suspect bearings or missing pieces of the blades. (unbalanced)
If it's a clanking type noise I'd suspect loose items hitting the fan.
The inducer motor will only operate right before and during burner operation, while the blower motor can operate at any time depending on your setting.
SOURCE: Dayton Furnace - Pilot Light Goes Out but Fan keeps running?
Pilot lighted furnaces have a thermocouple made from disasimilar metals that when heated create electricity to actuate a relay that alows the gas to flow to the furnace.
When the thermocouple gets coated with carbon from the pilot lights constant burning it acts as an insulator and keeps the thermocouple from getting enough heat to generate electricity, a very good safety factor.
What you have to do is locate the thermocouple it should be located over the pilot light, you will see a gray substance around the thermocouple it will be hard like cement, take a knife and scrape away as much of the gray material as possible then sand the themocouple with a medium sandpaper until it shines, use one of you wifes emery boards, this should solve your problem.
SOURCE: Propane patio heater ignition problem
I would change the thermocouple and here is why:
The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close.
Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners
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