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My furnace cycles too often. Do I suspect that my Honeywell digital thermostat (Model CT3500A) Smart Recovery features are faulty? How to you adjust the sensitivity? Thanks!

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  • lilamy Oct 24, 2008

    It helps somewhat as it narrows down the causes. I don't have the instructions as I bought an existing house. No luck in finding the manual at Honeywell site even though I think the thermostat model is about 4 years old. Model CT3500A). Thank very much jasond1011.

  • Anonymous Dec 06, 2008

    I replaced my old furnace in the spring, with a 2 stage Trane XL80. I had also replaced the old 1 stage thermostat with Honeywell's RTH8500. The furnace comes on every 10 minutes, runs for 5, and the temperature holds steady at the 21 degC setpoint. The older Hunter thermostat (also electronic) did not cycle often. Although the comfort level is improved now, my natural gas consumption has gone up over same period last year, by 10+ percent. I am very disappointed, and though I'd be saving money by upgrading the entire system. Not so.

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Recovery has nothing to do with on off on off. you have a new digital stat that holds an exact to the degree temp a change of a half a degree can bring it on.. so stat needs to be above main return 5 feet off floor. away from any drafts , doors supplys etc. also be sure the hole in the wall is sealed . the cold air in the wall is more than enough to make stat come on . they are incredibly sensitive.an old mercury bulb stat would have a swin g of 3 or 4 degrees . so set at 75 it may heat up to 78 and stay off till temp fell to 73 so you get a longer run cycle or and longer off cycle. the new ones are on off on off keeping a perfect temp 75 exactly. thory is the heat exchanger is already hot and a quick short cycle is more efficient than being off 20 minutes and reheating the heatexchanger from scratch again. having said that if you look aT the installer set up instructions that came with the stat it may give you an option to reset or adjust the stat so it will have a one (default) two, or three degree adjustment , so 75 equals up or down three degrees on call for heat.see honeywell toll free number in their literature

Posted on Oct 24, 2008

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