Question about Honeywell Programmable Thermostat Heater

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My Honeywell chronotherm IV Plus thermostat intermittent problem

My Honeywell Chronotherm IV Plus thermostat shows the system is on, but the fan and AC unit both are not running. I've reset it multiple times and tried two new sets of batteries. The receiving unit in the attic shows COM1 but still doesn't run. Thermostat is 2 years old.

This has happened 4 times in the last 2 weeks. Each time it is out for 4-10 hours during the day, and then starts running again during the night. It's good for a few days and then the same problem happens again. I even had the AC tech out but he couldn't find a problem (system had started working again at the time). Any suggestions? Thanks for your help.

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  • emvraa May 12, 2009

    I have a similar problem with a Chronotherm III. It appears to be working but neither the furnace or A/C come on.

  • Chantal Melser Sep 29, 2013

    What was your solution, please? We have the same problem, even after changing it for a second one! (second hand). I cannot find other solutions on internet, please, what was yours?

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  • 19 Answers

The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

Posted on May 17, 2009

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Posted on Jan 02, 2017

  • 308 Answers

SOURCE: my honeywell chronotherm III says -AC any ideas

The problem is your 24v power source. I am unsure as to why you put "other than power source or batteries". If you did indeed check that your thermostat is receiving 24v, then I would say that you have a bad thermostat. Hope this helps

Posted on Jan 23, 2010

  • 587 Answers

SOURCE: how do I program my honeywell chronotherm IV Plus

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.

Posted on Feb 28, 2010

  • 415 Answers

SOURCE: honeywell chronotherm iv fan keeps running even

Assuming you have the fan switch of your thermostat in AUTO, it sounds like a stuck Fan Relay. If the fan relay is stuck, your fan will continue to run as long as there is line voltage being fed to your unit. This relay could be an independent component or it could be an integral part of your control board. Have an experienced, qualified service technician check it out.

Posted on Mar 19, 2010

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2 Answers

AC chronotherm IV plus thermostat has no display and AC has gone off and will not come back on.


Either the 5 amp fuse is blown on the indoor unit, transformer is bad or float switch is tripped.

May 28, 2017 | Amana Heating & Cooling

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Honeywell Chronotherm iv Plus power cuts on and off


There's a trouble shooting guide here, you need to check for the presence of 24V when it goes blank, and trace back to where it's disappearing (I assume it is losing the 24v, if not you'll need to go through the installer setup or read on...
My first thought would be to check the wiring which has been touched last if it started doing that after you had coil replaced.
As an aside I'm not sure which model you have but if it has batteries you should replace them (I don't think it does have batteries but not seen a model iv so I'm unsure)

https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1410.pdf

May 12, 2014 | Honeywell Programmable Thermostat Heater

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Chronotherm 4 plus


change the batteries in the thermostat

Mar 21, 2014 | Honeywell Heating & Cooling

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I can't turn my Chronotherm IV plus off! Can anyone help me. It is going to cost a fortune


Depends what model number you have. The older models had problems. So Honeywell upgraded the model several times. When you say, cant turn it off. If that means the heat will not shut off then you have no choice to replace it, also if the heat,cool, off,switch will not work it is not repairable. Go to Home depot or menards and pick up a thermostat. Find somebody with some handy man skills and they can replace it for you.

Nov 28, 2011 | Honeywell Programmable Thermostat Heater

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Honeywell Chronotherm iv fan keeps running even when heat and cool turned off. How do I turn it off?


To turn the fan off, press the "fan key" until it says "auto". This will turn the fan off. When the programs scheduled, changes, the fan will go on again. You have to repeat the fan to "auto" each time the schedule changes.

May 12, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Chronotherm iv fan keeps running even when heat and cool turned off. How do I turn it off?


Assuming you have the fan switch of your thermostat in AUTO, it sounds like a stuck Fan Relay. If the fan relay is stuck, your fan will continue to run as long as there is line voltage being fed to your unit. This relay could be an independent component or it could be an integral part of your control board. Have an experienced, qualified service technician check it out.

Mar 19, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

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 Heating & Cooling

1 Answer

My home too is stuck at 78 degrees with the Chronotherm IV


a/c will only bring temp down about 15 degrees from outdoor temp

Jun 23, 2009 | Honeywell Programmable Thermostat Heater

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