Question about Dayton Gas Furnace Heater

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Furnace blower won't turn on... Forced air gas furnace was working fine for three weeks. Now: Turn themostat up Gas comes on, pilot light obviously working Box heats up for about 90 seconds Humidifier motor comes on (meaning signal being sent by furnace) Blower motor does not come on Gas turns off after a while... probably due to a sensor. BUT: Once while trying to start it... .... .... Box heats up for 90 seconds BLOWER CAME ON... but shut off after about 90 seconds (that's the weird part - what wd make it cut out so fast - thermostat was turned right up) This scenario only happened once but at least it meant that the motor and blower are working. I haven't opened up the furnace yet, but was wondering where I should start troubleshooting this. I can provide a photo of the inside of the furnace, esp any sensor equipment or circuit-boards if required. This furnace is 25 years old but I'm not in a position to replace it right now. Any ideas from some knowledgeable people would help. I'm fairly handy with tools, BTW. Any help is greatly appreciated on this.

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  • TO Lady Nov 11, 2010

    Never mind, we troubleshot it and it's a wire from the motor that has worn through against a piece of metal with vibration from the motor. ahhhh, thankfully nothing $$$$$.

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If it indeed started that one time for a short period then cut out, the first place that I would start would be the capacitor located in the blower compartment. The capacitor gives the motor the need kick to start, and often times stays in the circuit to help the motor run more effeciently. This could very well be the problem.

If you have the option to run the fan from the thermostat, turn the fan to the "on" position and see if it starts. If it does, then it is not the capacitor.

Hope this helps

PS Your are correct about the "sensor" turning the furnace off, it is called a high limit switch and is there for safety. It is an automatic reset device, and will reconnect power once it has cool suffeciently.

Posted on Nov 17, 2010

Testimonial: "Thank you so much for this help. We discovered a wire had worn through from the vibration of the motor, replaced the wire and good to go. Phewwww! "

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