Question about Honeywell Programmable Thermostat Heater
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.
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
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
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
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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