Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Have gas furnace and this winter,began having

Have 11 year old gas furnace & this winter,began having problem with furnace heat not going up to thermostat setting. the colder it is outside, the less the furnace will go up to temp setting. Replaced thermostat and still happens. if set at 70'-will go to 70' if temp outside is in the 40's. if outside is in 20's, will only kick in if inhouse temp goes below 65'. If around 15' outside, will only kick on if thermostat inhouse temp drops below 62'-all with thermostat SET at 70'. Doesn't matter if on 'schedule' or 'temporary' setting or if you increased temp to 75'. If around 15' outside, sticks at 62' and cannot get indoor temp above that. What could be the problem?? Never knew of a thermostat readjust to the outside temp.

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  • Anonymous Mar 14, 2014

    Having problem setting thermostat

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The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.


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Posted on Mar 12, 2009

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