Question about Honeywell Programmable Thermostat Heater

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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.

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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

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Honeywell CT3400. New batteries but touch pad has become unresponsive


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.

Nov 21, 2013 | Honeywell Programmable Thermostat Heater

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I have a Honeywell Thermostat. I don't know the model number, but it states "replace battery" and no longer lights up. The problem is I don't know how to remove the cover. Please advise


DEPENDING ON THE TYPE OPEN COVER AND LOOK FOR 2 SCREWS IN THE LOWER CORNERS. OTHERS WITH NO SCREWS LIFT OFF FROM BOTTOM TO TOP BY PULLING OUTWARD ON BOTTOM. DONT FORCE LOOK IT OVER. WILL NEED TO REPROGRAM WHEN DONE.

Jan 05, 2011 | Honeywell Programmable Thermostat Heater

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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

2 Answers

Problem with Honeywell RTH230B Thermostat


Sounds like you have it wired wrong..   Pop the top off and give me to color of the wires and tell me which letter each color wire is on.. that will tell us right away if you have it wired wrong

May 27, 2008 | Honeywell Programmable Thermostat Heater

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Honeywell Programmable Eletronic Thermostat model RTH230B


There are so many products, we cannot help without the model no. Try typing 'Honeywell programmable electronic thermostat' into google and searching for an image of your thermostat, then get the model no. Then you might be able to get some help.

Dec 20, 2007 | Honeywell Programmable Thermostat Heater

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