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Thermostat malfunction I have a Honeywell Chronotherm III Thermostat model T8602B1006 and I cant get it to go back to normal after I have replaced the batteries and reset it. It is just stuck on a wake setting and the heat will not come on. What can I do, other than what I have done?

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Re: Thermostat malfunction

You may want to shut the breaker off to your furnace or air handler, or if you have a packaged system turn it's breaker off. This will kill the low voltage to the stat possibly allowing it to reset. I would also try to reset it after you turn your breakers back on.

Posted on Dec 23, 2007

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All I need to know is this: The Chronontherm III died (my house is 20 years old and I believe it was original to the house) and I need a new thermostat. Can I replace the Honeywell Chronotherm III...


Yes, you can replace with that...just make sure that you mark the wires BEFORE removing you can place them on the same terminals on the new t-stat...

Here is a list of each common terminal and what their commonly used for. Also listed is what colors are commonly used. NEVER ASSUME these are what you have. Verify all your wires by following each to each piece of equipment. This will help you to be able to match your equipment with the terminal.

Here is the rest of the tip that I wrote...

Thermostat Wiring and Terminal Designations


Jan 11, 2011 | Air Conditioners

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Dear customer service, I actualy don't have a technical problem with my Honeywell Chronoterm. I'am looking to find an english manual which will allow me to operate it. Most a website that I browsed to,...


FixYa doesn't have these manuals - nor is it associated with Honeywell. FixYa is a bunch of technical people with all types of expertise that like to help people with problems. As such, most of us would simply point you to a website where you can download the manual for free. Emailing requires you to download, too so I don't know why you want it emailed as opposed to simply downloading it yourself directly.

If you want a copy of the manual mailed to you - you'll have to contact Honeywell directly.

Lastly - Honeywell makes a "boatload" of thermostats. The Chronotherm line has a number of different types. To get the right info - you'll need to provide the full model whether it is a ChronoTherm IV or ChronoTherm CM67 or other model - regardless of who you make the request to.

If I can help - let me know - be sure to include the full model number with your request.

Dec 27, 2010 | Air Conditioners

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Aux heat light is dimly lit when A/C kicks on. It's a roughly 10 year old Chronotherm III.

Take a meter capable of reading AMPS and place it on the incoming power lead to the air handler. If you read amps in excess of 2.0 the heater is engaging. It could be a bad thermostat or a bad heat relay.
If you read 2.0 amps or less it is a bad thermostat.

Sep 22, 2009 | Carrier Air Conditioners

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AC, Fan-Auto, Fan-On... nothing works. the request from the Thermostat doesn't engage anything. Thermostat Dispay works. How do I know if it is getting the 24volts from the relay? I presume the display...

Open the air handler. Locate the low voltage transformer. One side is 220 volts input. The other is 24 volts output. Take your VOM and touch the test leads to the input to verify 220v in. Then touch the other 2 leads to verify 24v out.
If you have power in and no power out, replace the lv transformer.

Jul 08, 2009 | Honeywell Air Conditioners

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I have a Honeywell Chronotherm IV Plus a/c unit and I can't get my air condt. to turn on. The room temp. says it's 17 degrees in the house so it won't turn on. I need to know how to reset the room tempt....

Not only are the Chronotherm IV's less than user friendly, they have a terrible failure rate. It sounds like one of the typical failures of the chronotherm IV. I suggest starting with a new thermostat.

Jun 12, 2008 | Honeywell Air Conditioners

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