Troubleshooting Furnace Issue - Reaches temp, clicks off, and back on

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Old 10-31-17, 07:11 AM
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Troubleshooting Furnace Issue - Reaches temp, clicks off, and back on

Hi. We are having an issue with our gas furnace. It clicks on, gets up to temperature, clicks off and then immediately clicks back on then off. It doesn't do it every time and sometimes it will do that on off quickly 3 times before shutting off completely. The furnace is a Bryant - Model number starts with 394G...
Before we put it in use we cleaned it, changed the filter, cleaned out the cold air return. Last year we replaced our old thermostat with a digital programmable one. Could the issue be in the thermostat? Or is it a furnace issue? Thanks for any help you can point us to look.
 
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Old 10-31-17, 09:14 AM
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http://dms.hvacpartners.com/docs/100...0394DP16-A.pdf

Wow, is this furnace from the 70's ?

Does it have a fan limit?
 
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Old 10-31-17, 09:38 AM
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According to what I could find about our serial number it isn't quite that old, 1986, Still old, I know, but we've had zero issues with it in the 18 years we've lived here. Where would I look for a fan limit?
 
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Old 10-31-17, 09:59 AM
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It sounds like you are describing a fan limit issue. The fan limit can also do this if you have an air restriction like a dirty evaporator coil or plugged air filter.

A fan limit looks like an analog clock if you pop off the cover. It acts as a timer and controls fan on, fan off, and gas off at 3 different temperatures.
https://www.youtube.com/watch?v=gP9ZN6nFCqk
 
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Old 10-31-17, 10:54 AM
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Thank you! I've been searching since you posted and have learned about them. Will go look and check it out. Thanks so much! Hopefully we can narrow it down and get it working properly!
 
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