How do I change the batteries on a honeywell/34 Model CT3400

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How do I change the batteries on a honeywell/34 Model CT3400

Trying to change the batteries on my thermostat, where do they go?

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How do I change the battery on Honeywell Thermostat T8001C?

According to the manual for the model series (see link), only the T8002 Model has batteries. They are accessed from the right side of the thermostat. See page 14.
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1431.pdf

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Changing batteries I Honeywell thermopro 3

Any Honeywell thermostats I have come across you slightly tug on bottom of thermostat which disengages it from the wall and lift up. Batteries are then exposed. Replace with new and reverse take-off procedure to remount. If I remember correctly these do have a small battery backup to save your initial settings so you do not have to reset time and program. Can you tell me the complete model number of thermostat or send a picture of it?

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Turn the furnace power off for 10 minutes (the control wiring up to your thermostat is powered from a transformer in the furnace) & turn it back on. Make sure you have 24 volts to the Red wire on the thermostat.

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How do i reset my honeywell thermostat

Remove thermostat from wall, leaving base plate on wall.
Model number appears on back of device.
Google search thermostat model in following format: Honeywell xxxx32 thermostat .pdf
Adding .pdf to search parameter will yield product manual.
Also while thermostat is off the wall, change batteries located in compartment on back of thermostat. These batteries must be changed periodically, for example each 3-4 years.

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Need honeywell 97-3893 thermostat manual for battery change. Thanks!

The model number is CT3400. You can look up the manual at http://yourhome.honeywell.com/home/Applications/SmartSearchResults.aspx?searchkey=CT3400

Nov 04, 2010 | Honeywell Heating & Cooling

1 Answer

We just replaced the batteries in our Honeywell CT3400 thermostat, and for a moment or two, the display came on, but the thermostat was not responsive to the touchpad. Now, the there is no display, and we...

HONEYWELL WEBSITE:
Go to honeywell.com
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.

Jun 05, 2010 | Heating & Cooling

1 Answer

My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.

Try to find a reset button or just change out the thermostat. I'm guessing you don't have the manual. Thats a pretty old model, I think you have to set the time and day before you can use the thermostat.

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I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...

The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

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How do I open the Honeywell programmable thermostat Model CT3400? I've never done it before and don't know how to open it.

Go to myhome.honeywell.com and search for a manual for your model number thermostat on the right hand side of the page.

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I have 3 Honeywell Programmable Thermostats CT3400 throughout the house, but for one of them, the digital screen started to dim (the digits are now hard to read). I replaced the batteries thinking that the...

time for a new stat

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6ya staff · Answer 1 · 1/2/2017 12:00:00 AM

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HANK MCNEIL · Answer 2 · 10/5/2009 12:00:00 AM

HANK MCNEIL

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SOURCE: How do I open the Honeywell programmable

Go to myhome.honeywell.com and search for a manual for your model number thermostat on the right hand side of the page.

Posted on Oct 05, 2009

How do I change the batteries on a honeywell/34 Model CT3400

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6ya staff

HANK MCNEIL

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Need honeywell 97-3893 thermostat manual for battery change. Thanks!

We just replaced the batteries in our Honeywell CT3400 thermostat, and for a moment or two, the display came on, but the thermostat was not responsive to the touchpad. Now, the there is no display, and we...

My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.

I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...

How do I open the Honeywell programmable thermostat Model CT3400? I've never done it before and don't know how to open it.

I have 3 Honeywell Programmable Thermostats CT3400 throughout the house, but for one of them, the digital screen started to dim (the digits are now hard to read). I replaced the batteries thinking that the...

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Heating & Cooling

How do I change the battery on Honeywell Thermostat T8001C?

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My JULI DDL5550 sewing machine staring running then shut off imediately. What cause of it? I replaced new motor starter capacitor

My JUKI DDL5550 start running then shut off right away ? I did replace new Capacitor motor starter

Onida S18MVD-W5 the indoor part is quite noisy ,its like a wave sound and blower air suction is less ?????

I NEED SCHEMATIC FOR A/C COMFORT AIR MODEL RSD1036-1Y

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How do I change the batteries on a honeywell/34 Model CT3400

2 Suggested Answers

6ya staff

HANK MCNEIL

Add Your Answer

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How do i reset my honeywell thermostat

Need honeywell 97-3893 thermostat manual for battery change. Thanks!

We just replaced the batteries in our Honeywell CT3400 thermostat, and for a moment or two, the display came on, but the thermostat was not responsive to the touchpad. Now, the there is no display, and we...

My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.

I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...

How do I open the Honeywell programmable thermostat Model CT3400? I've never done it before and don't know how to open it.

I have 3 Honeywell Programmable Thermostats CT3400 throughout the house, but for one of them, the digital screen started to dim (the digits are now hard to read). I replaced the batteries thinking that the...

Not finding what you are looking for?

Heating & Cooling

How do I change the battery on Honeywell Thermostat T8001C?

Open Questions:

My JULI DDL5550 sewing machine staring running then shut off imediately. What cause of it? I replaced new motor starter capacitor

My JUKI DDL5550 start running then shut off right away ? I did replace new Capacitor motor starter

Onida S18MVD-W5 the indoor part is quite noisy ,its like a wave sound and blower air suction is less ?????

I NEED SCHEMATIC FOR A/C COMFORT AIR MODEL RSD1036-1Y

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