Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
Honeywell th320u thermostat will not allow for adjustment below 70 degrees! I have tried reprogramming/resetting/beating with a hammer and it will not go below 70. Honeywell says to call a service tech! Ha- I have three here with me now and they can't seem to figure it out either!!!! What do I do?
The cooling setting will not go below the heating setting. lower the heating setting so you can lower the cooling
Posted on Jan 16, 2018
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Posted on Jan 02, 2017
The Honeywell CT87 thermostat is a normal round thermostat, not digital and may have a sub-base installed with it that has a two switches on it. One is for Fan (Auto or On)and the other is for Heat, Cool and Off. Make sure the Fan switch is in the Auto position and the other switch is in either the Cool or Off mode. If you continue to get cooling, you have a short in the thermostat wire or a stuck relay in th indoor or outdoor unit. To test this, while the unit is running; remove the round outer ring on the thermostat by pulling it straight off towards you. You will find 3 slotted head screws that hold the thermostat to the sub-base. These screws are located at the 3 o'clock, 7 o'clock and 9 o'clock positions. Turn these screws counterclockwise with a small head screwdriver. They are held in place so should not fall and get lost. With the front of the thermostat removed from the base, the air conditioner should stop running. If the unit continues to run, you will need to have your A/C system inspected by a technician. If in fact your thermostat is digital, look to see how it is mounted to its sub-base and remove it. If the system stops, you may have a bad thermostat or the Fan switch is in the On position. Hopefully this will help.
Posted on Sep 12, 2007
controllers more than likely on a memory lockout... kill the power and take the batteries out of it... leave it for 60 seconds and try again... unfortunately you are probably going to have to replace the controller, sorry
Posted on Jun 16, 2009
Is there a setting on your thermostat that makes the unit stay on for 10, 15, 20, 25 minutes after you reach set temp. You can change this setting by looking at your manual for the thermostat. Not sure if there is one for this thermostat but mine has one. Mine was running 15 min after set temp and making it cool down 2 degrees lower than set temp. Hope this helps.
Posted on Jun 25, 2009
Yes you can change that by change the number of cycles per hour that your t-stat looks from for youe furnace. Lower the cycles per hour number and it will increase the range.
You can see how to do it here
I hope that this will help you to solve your problem!
Thanks for using Fixya!!
Posted on Dec 12, 2009
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