Question about Honeywell Programmable Thermostat Heater

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Honeywell Chronotherm IV Plus requires frequent resetting.

We recently moved to this house. Since we began using the heat, the programmable thermostats have to be reset almost daily. (There are three thermostats -all have to be reset often but one has to be reset almost daily.) We thought it might be that the batteries needed to be replaced, but there are no batteries.

I am not sure which model we have, but the owner's guide is for the CT3500 and CT3595.

Any suggestions why this is occurring? I need to get this resolved as my wife works from home.



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  • jandn911 Feb 02, 2009

    having similar problems.. have you found a resolution. We too just recently moved into our house, so have no history or manual.

  • omsms Mar 04, 2009

    I bought this thing with a new heating ac system some 18 months ago. What a piece of ****. It is tooo smart and tries to do too much. It measures the wall temperature and matches that against the air temperature to get a more "reliable" reading. What a joke that is, first, if its an outside wall you are screwed, second, it will run heat or ac until the WALL reaches the desired temperature. Thats ok if you never setback but if the wall gets cold during the night, the next morning, heat will run like crazy until the stupid wall warms up.

    I have seen the dumb thing calling for heat even when the displayed temperature is three degrees above the setpoint with no end in sight.

    The pre heat function was so bad, I finally turned that off. It started the heat 5 hours before I wanted to get up, baking me in my bed in the process.

    Tech support is some Indian company where they barely speak English, email replies are canned and worthless.

    Forget this piece of **** and just get a regular setback thermostat. All the bells and whistles are just gimmicks that don't work.

  • omsms Mar 04, 2009

    Everybody I know regrets buying or having one of these things.
    Honeywell gets so many CS calls on this thing they have canned answers like "its your furnace".

    My furnace?? How would my furnace be affecting the thermostat?

    Too bad honeywell has gone the route of all the crappy companies. They used to be pretty awesome.

  • eimpala May 11, 2010

    Can you remove the thermostats and get the model numbers on the back of the stat? Do you have a zoning system, or three separate systems?



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  • 308 Answers

Check to see if you have wires going to a C/C1 terminal. The older chronotherms used a transformer to supply 24 volts to power the clock. If in fact you do have these terminals, then I would suggest checking the output voltage on the transformer, (secondary (24v)side) to ensure it isn't close to dead. Hope this helps

Posted on Jul 20, 2009


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Posted on Jan 02, 2017

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SOURCE: my honeywell programmable thermostat chronotherm

Hi, if this thermostat has batteries, try and replacing them. It sounds to me as though the circuitry in the sub-base has a problem keeping the stat programmed. Shutting down with in 30 seconds and back on only to shut off again tells me that the sensor that is a part of the circuitry on the sub-base that senses the rooms temperature, has failed and it cycles on and off. If it does have batteries, change them to see if this solves this problem. If no batteries, shut the power off to the a/c and remove the cover to the stat. If this does not expose the control wires, you will have the stat sub-base to remove. It will have several small screws that will need to be loosened to get to wiring. If your system has a gas furnace or electric heat and not a heat-pump, you will have terminals marked like this. RH, RC, with a jumper wire connecting the 2, W white for heat control, G, green for fan control, and Y, yellow or they may have used blue for cooling control. You can pick up a new programmable thermostat at Home Depot, Lowe's hardware for this for around $30. It will come with the Red jumper already wired in and this is where you connect your existing red to either one, but leave this jumper on. This will solve your problem. If you have no gas furnace and it is a heat-pump, it will have many more wires and terminals such as this, R, W-1, W, E, O, B, Y, C. Draw your self a diagram on the wire terminals and colors of all wires and what terminals they are connected to so you get it right and take this along to match it with the correct heat-pump thermostat. Honeywell has good dependable stats, so try and stay with them. If the price for one is off the wall, go with a White Rodgers, Hunter, Carrier, and just look them over good. Read to see if they have batteries for the display and if they are included with the stat. This will solve this problem. Please don't forget to rate me on this as I know you will be kind. I will be checking in to see how you are coming along and if you need more help as I will be here.
A/C, Heating, & Refrigeration Contractor.

Posted on Aug 30, 2010

  • 80 Answers

SOURCE: honeywell chronotherm IV Plus thermostat

There are no batteries on an 8600-8601-8602 series

Posted on Sep 19, 2008

  • 9 Answers

SOURCE: -AC appears in the display of chronotherm III

I have had the same problem- twice. It was a similar but different problem each time. The -AC means the ac control voltage isnt making it to the thermostat. In my case both times it was a switch in the control circuit that wasn't closing properly. The easiest was the front cover switch. If the front cover is removed from the furnace or has vibrated loose, the switch will open, preventing the furnace from running. The other instance I ran into was a flow switch on the exhaust blower which ensures the there is flow OUT the chimney. The switch wasn't functioning, so the furnace wouldn't start. The blower would come on for a short time, but the burners wouldn't light.

Hope this helps,

Posted on Dec 12, 2008

  • 587 Answers

SOURCE: how do I program my honeywell chronotherm IV Plus

Go to
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.

Posted on Feb 28, 2010

  • 587 Answers

SOURCE: i have a honeywell chronotherm iv plus thermostat

Go to
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.

Posted on May 10, 2010

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