I just changed the filter in my furnace, how do I reset my thermostat to make the word "filter" stop blinking. I called the service dept. and they told me to find my users manual! I can't find it. HELP!

What make and model is your thermostat?

Here's one reset solution for a Honeywell Thermostat. I don't know if yours has an "i". This is how I reset mine.

Honeywell Programable Thermostat filter reset | Homeowner's Blog

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Originally Posted by Perito

What make and model is your thermostat?

Here's one reset solution for a Honeywell Thermostat. I don't know if yours has an "i". This is how I reset mine.

Honeywell Programable Thermostat filter reset | Homeowner's Blog

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Thanks, It did work but still my AC doesn't work> I guess I need to call a tech.

If you still cannot find the answer and your unit has an “i” button, here’s what I did:
1. Open the control panel cover.
2. Press the “i” button.
3. The following should appear on the screen. (If not, press the “i” button until it does):
0 AIR
Days Filter
4. In the control panel, press the ^ (up) button under the word “Time” once.
5. The Days should change from 0 to 90.
6. You are now good for 90 days.
7. Close the control panel cover. You are done.