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My T8602C Chronotherm III will not power up. When I turn it on the display is all fine. It just doesn't seem to be getting any power from the main unit

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SOURCE: my husband &i just purchased

here is a link to a website that will provide you operating instructions. Hope this helps...


Posted on Sep 23, 2008

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Coleman 2ton Basement air does not respond to thermostat but will turn on and run fine after 6 to 36 hours

Check contactor in condensor,if it looks good check refrigerant levels if you're EPA liscensed.

May 25, 2014 | Coleman Mach III Air Conditioner

1 Answer

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

1 Answer

The digital display on my honey well chronotherm IV plus goes dead for anywhere from 10 minutes to a couple days and during that time the furnace does not function, then it will pop back up and everything...

The brass terminals, between the front and the subase tend to corrode. Turn power to furnace off, loosen two screws at base of front cover, pop bottom from wall, clean brass spring contacts and matching pins, with fine sand paper or emery board.

Nov 24, 2010 | Air Conditioners

1 Answer

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

1 Answer

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

1 Answer

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.

Dec 22, 2007 | Air Conditioners

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