Question about Honeywell Programmable Thermostat Heater

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Blinking symbol There is a blinking symbol. I think it said filter below it and now it doesn't say filter but is still blinking. I bought a new filter and was going to put it in but the one that was in the furnace was brand new and I have not have the air or furnace on for at least two months. I can get the outside cover off but can't get the rest off to see if the batteries need changing. Thanks for your help.

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  • Anonymous Dec 16, 2008

    my programmable


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Look for a reset selection on the thermostat. The Filter warning is probably programmed to come up on 90 day intervals.

Posted on Oct 20, 2008

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Snowflake symbol and filter message

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The unit keeps flashing

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If the symbol continues to flash for an extended amount of time, then the problem is in the furnace, air handler, etc.
If the system is working, but flashing, then it could be the programming of the thermostat.

Dec 02, 2013 | Honeywell Heating & Cooling

1 Answer

My program sequence has been fine. Last week the time was blinking and then blanked out so I thought it was batteries. Changed them, now the time is wrong, it's still blinking but I can't change to the...

Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Feb 21, 2010 | Honeywell Programmable Thermostat Heater

1 Answer


Look at the bottom door on your furnace,and find the small lens.Watch the red light blinking, and count tthe blinks. It is probably a dirty flame sensor. Shut power off ,pull flame sensor out, and clean it with a "dollar bill", and reinstall it.If you are smart enough to pull the doors off your unit, the bottom door has a section on it telling you diagnosis light solutions.

Feb 16, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

How do i stop the filter message blinking?

go to, there they have a search engine. Put in your model number of the thermostat and look for the users manual.

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