Question about Honeywell Programmable Thermostat Heater

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Honeywell T8011R We lost power last night and woke up to no display on our honeywell T8011r. Fan still works when turned on. I took it off the wall all the wires and everthing looks okay, we flipped the breakers on and off still nothing. I have read other units haveing a switch on the back but this one doesn't. I also talked to a honeywell tech that had me check everything and decided it has to be an electrical issue and we are not getting between 24 - 30 volts. We use a voltage meter and it is reading 26 (if we did it right). Any suggestions, its getting into the 30s tonight. :{

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  • mwhite31288 Nov 07, 2008

    Well I don't know what happened but after taking the thermostat with me today to price new ones, I brought it back home for one last try. After popping it back on everthing lit back up and showed 88 degrees, obviously from the car ride home and the heater blowing on it, because my house is only at 60 at this time. So for some reason it is working again. Any ideas what might have happened, can it reset itself from the drastic temp. change?



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Had similar experience. Display off and no fan power. I replaced the unit after an hour and the display came on. I guess a pin needed to be reset (cleaned by wiping against contact). Hope it stays on.

Posted on Mar 19, 2011

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Check for either an in-line fuse in the heating unit or a fuse on the control board also in the heating unit.

Posted on Nov 07, 2008

  • Chandler Ede
    Chandler Ede Nov 08, 2008

    Maybe one of the pins were not making connection and when you removed it, it fixed it self. Stranger things have happened.



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We have the T8011R Honeywell thermostat. We had storms last night when the power was restored the thermostat with making a clicking sound and everything is lit up. How do we reset it?

Thunder and lightening cause "Static" to fly through the air around your house. It fried the motherboard on my TV and a T-stat on a friends wall. All inside the house. The clicking comes from the miniature relays built into the electronics of the thermostat and they have been compromised, so just get it replaced. There is no resetting it. Your deductable on homeowners insurance is probably more than a replacement.

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I have Honeywell T8011R programmable Thermostat. Turn AC on last night for first time...working fine...came back late morning to find display and fan off. Check circuit breaker...on. I took it off and...

Hello, first you must verify if you are getting 24 volts to the tstat at the secondary side of the transformer, if not you have a bad transformer. If you are getting 24 volts then check the batteries in the thermostat.

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Here is a link for the owner's manual. It gives several suggestions for the cause of the display being blank. Check those and let me know if that helps.

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After a power outage my T8011R display will not come on. Breaker is on and the auto fan works--so there is electricity to the thermostat. Is it fried or is there a reset or fuse that I need to address?

Hi, if the stat is working and running the fan, what has happened is the circuitry is faulty that shows the digital display. Before we are certain this has happened, check to see if the stat has batteries in it. Pull the front cover off and check. If it does, replace them and see if the display returns. If it does great! If not its the circuitry in the stat and will need to be replaced. Keep me posted.

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Honeywell T8011r does not have anything on display - does not appear circuit breaker is thrown - could it be wire disconnected at the plate or is there a fuse inside the unit?

Check to see if you have power at the furnace. You thermostat is powered by 24vac coming from the furnace. You should have power on the "R" terminal.

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After being disconnected from the expert, whom wasn't of any help, I called our AC/Heater maint. person for service. Upon hearing the problem he told me to turn the power source off for at least 30 minutes. After restoring the power source everything worked fine. The secrret is leaving the source off for at least 30 minutes. Your expert advised to turn the source Off and then back On which didn't solve anything. This remedy may work with other Honeywell models as well.

In all due respect, I hope I'm not charged for the lack of results which your expert provided.

Frank Mooney

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Hi, take a look on amazon for replacement, here: Defy Mother Nature with our Best Buy. I hope this was helpful. Cheers

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which model do you have ? the 8000/8001 or 8011 the set is different depending on your type of heating system. This model has a memory chip not a battery that saves your settings. So you could be looking at replacing the unit.

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