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My honeywell a/c not coming on.just replaced batteries

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Check breakers to furnace

Posted on Aug 10, 2008

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Honeywell RTH2308 batteries were dead so replaced and now furnace will not start


Replacement batteries may have been installed incorrectly. We've all done that, and on a Honeywell too. Also it is possible replacement batteries are no good. We've all done that as well.

Apr 19, 2018 | Honeywell Heating & Cooling

1 Answer

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?

Dec 30, 2013 | Honeywell Heating & Cooling

1 Answer

I have a honeywell thermostat t6360.the light stays on continuously whereas before it only came on when the heating was due to come on.now the heating doesnt come on at all.


Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?

Nov 02, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Touchscreen is not functioning


First try replacing the batteries. I have a slightly diff honeywell model and it takes 2 "AAA" batteries. The battery holder comes out the side of the unit, just press where it says press and pull out.

Sep 11, 2012 | Honeywell Rth8500d 7-day Touchscreen...

1 Answer

Honeywell digital thermostat went blank, ac unit wont come on, its an 8400c, no breakers tripped


This thermostat has batteries. Try replacing the batteries. You may have to reprogram and make sure it is on.

Jul 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Access to batteries


The front should come loose from the base and the batteries will be on the back.

Apr 02, 2010 | Honeywell Electronic Programmable...

1 Answer

Replace battery


Yes, the battery must be replaced. Gently lift or pull of cover, the battery compartment is there. Best of wishes.

Jun 15, 2009 | Honeywell ER150B Air Conditioner

1 Answer

How to remove thermostat cover to replace


the cover pulls off if it has a green screen then most likely takes batteries if does not light up then no batteries with a small piece of insulated wire jump from green to red if indoor fan does not come on then transformer bad

May 15, 2009 | Honeywell Programmable Thermostat Heater

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