Question about Honeywell Programmable Thermostat Heater

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Ac will not kick on

I have an older programmable thermostat.....trying to get my ac to kick on...word filter keeps flashing. I changed the batteries, pressed the arrow button down to lower, but still will not kick on. checked circuit breaker, it's fine...I don't know how to work this thing. What am I doing wrong?

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That is just a change filer signal. It does not chut your ac down to clear some tstats you push up and down keys at same time. I need to know what kind of tsta you have and I can tell you how to clear it. Russ

Posted on Jul 23, 2009

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The word filter keeps flashing on the thermostat. Why?


Filter change indicator - will flash after 400 hours of system use as a reminder to check or change your filter. Press and hold the Filter button for 3 seconds after changing the filter to reset the filter timer. (Pressing the Filter button for less than 3 seconds will cause the Filter change indicator icon to appear. The filter timer will not be affected unless the button is held for more than 3 seconds.) Note: Clearing the Filter counter will also clear the Energy counter.

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I am not familiar with this particular thermostat; however, here's some general information; I hope this solution will help you troubleshoot.
Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

setOFF manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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I am not familiar with this particular thermostat; however, here's some general information; I hope this solution will help you troubleshoot.
Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

from my understanding there are two types: programmable and non-programmable.

setOFF manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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I am not familiar with this particular thermostat; however, here's some general t-stat information; I hope this solution will help you troubleshoot.

Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat for the group. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

disable auto & enable manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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1 Answer

Installed an rth2510 and installed as labeled on old stat and sounds like my ac nut is buzzing outside, any thought?


question: do you have a multiple thermostat setup in 1 zone? If so check what settings are for your heat on each thermostat. Make sure that the heat is not set higher than the room's temperature.
check what settings are for your cooling on each thermostat. Make sure that the cooling is set accordingly.

if you have multiple thermostats setup in 1 zone. the thermostat with the lowest temperature will reign supreme. The heat setting on that thermostat will be what's causing the buzz on the heater.

optionally, hard reset your thermostat as a precaution. Here's how to do so: there are two types of thermostats i know of programmable and non-programmable.

disable auto & enable manual; however do NOT change settings or power-off t-stat. Remove battery and power down the thermostat until you see nothing on the thermostat monitor; power OFF the switch connected to your t-stat. Remove battery and reinsert inverted, if needed, press whatever button that your heart desires to make sure that nothing is absolutely drawing into that mode, button, etc; wait (5sec-1min); remove batters; wait 1min; then, reinsert batteries in its correct position; if you have a programmable thermostat; do the same with the hit 'reset filter' held down observe if the roomTemp reading has changed.

May I suggest to keep an extra thermometer around to determine if temperature reading accurately?

If reset requires a reprogramming to your t-stat, do whatever required to set your desired setting.

cheers, best of luck. i hope i've helped.

background, doing a hard reset in my opinion is similar to removing the battery from a PC motherboard.

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I am not familiar with this particular thermostat; however, here's some general t-stat information; I hope this solution will help you troubleshoot.

Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an eye on how much draw your AC is doing on your meter.

setOFF manual; however do NOT change settings or power-off t-stat. I'd keep it on what you had intended it from day1. However, some may debate to turn everything off beforehand. personally, myself, poweringOFF the switch connected to your t-stat works. Remove battery and reinsert inverted; wait (5sec-1min); remove; wait 1min ('debatable' timeframe 5sec - 1min); reinsert batteries correctly; if you have a programmable thermostat; do the same with the hit 'reset filter' held down & wait 5-sec1min; observe roomTemp reading. May I suggest to keep an extra thermometer around to determine if temperature reading from the thermostat correct? Friendly reminder to turnOFF 'auto' mode during this hard reset. If reset requires reprogramming your t-stat, do whatever required to set your desired setting. cheers. best of luck.

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Our TH8000 Series Programmable Thermostat keeps flashing "change filter" even after we changed it. The guide book does not show how to re-set so the flashing stops.


try holding the filter button in for three seconds, if that doesn't reset the timer try the filter button and the temp. up button at the same time for three seconds.

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