Replacing programable thermostat with basic Honeywell CT31 electro-mechanical. A/C now runs continuously regarding of thermostat setting. No heat. We have to shut it off at the breaker box.

Here are some options:

Honeywell Home Non-Programmable Thermostats: These thermostats are designed for simplicity and comfort control. They come in a range of models, from the classic circular dial to easy-to-use soft-touch buttons and backlit displays. You can easily set your preferred temperature with the touch of your hand. The Honeywell Home website has a range of non-programmable thermostats to choose from .

Honeywell Home Programmable Thermostats: These thermostats allow you to set different temperatures for different times of the day. This can help you save energy and money on your heating and cooling bills. The Honeywell Home website has a range of programmable thermostats to choose from.

Honeywell Home Digital Non-Programmable Thermostat RTH5160D1003/E: This thermostat is simple and intuitive to use. It has a backlit screen and basic button functions that make it easy to control the temperature. Once you set your desired temperature, the thermostat stores it in its memory, even during a power outage. Non-Programmable Thermostats ' Honeywell Home RTH5160D1003/E Non-Programmable Thermostat ' Honeywell Home Might as well look at the programmable ones on their site. Check their customer service if you have an additional question. The above mentioned should work with your setup.

The Honeywell RTH230B indicates that the system is running the overnight (sleep) program with the 4 inside the house symbol. When the house flashes, the desired temperature has been changed from that programmed temperature (bypass mode). The bypass mode should only run for 2 hours.

The default programming starts the sleep period at 10 P.M. and ends at 6 A.M. On the original program in the thermostat, the temperature target was set to 62 during the heating season and 82 for the air conditioning season.

Since the thermostat was set to bypass, you should check who in your house pressed the Up/Down buttons on the thermostat to change the house temperature. Beyond that, check the start and end times and the programmed temperatures for each scheduled period. Honeywell has the manual for the RTH230B here: https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf .

I hope this helps

Cindy Wells
(On my own programmable thermostat, we recently found that one period in the week had been left at the default setting. Thus the thermostat was programmed to maintain 60 degrees when we wanted 65 during the day.)

Hello Donna,
You are right. The Auto setting will allow the fan to shut off when the fan is no longer needed.

Why would you want to set the thermostat below 40? They do that so people won't freeze pipes keep in mind if it's 40 upstairsit's probably near freezing in your basement if applies. Did you label the wires from your old Tstat or take pictures? You can't always go off colors. If this is a heat pump you may need a pro or you'll end up causing damage that may get expensive vs trying to save and doing it yourself.

Hi Kathi,

I think its thermostat or ,thermo sensor is out of order and if it is controlled by electronic circuit it can be faulty.
another thing sometimes output contact relay for motor is faulty it want turn off itself when the circuit energize the coil.

please call electrician who can handle.

regards,
nuwan.

Try replacing the barrery.

I have an old Honeywell ST499A/ST699B thermostat. It still works OK but when we have a power cut I have to re-programme everything. Presumably this is because the battery needs replacing. I cannot find a way of opening the control box to get into the unit to replace the battery and in any case I’m not sure if the battery is renewable?

The thermostat will not cut off the A/C until the thermometer reading gets to 76.

If there is not a heat source near/behind the thermostat which is causing the thermometer to read higher than actual room temperature, it sounds like the thermostat thermometer is out of calibration.

There are ways to calibrate it, but much to involved to go into here.

One solution is to just set the thermostat at 80, knowing that it's really set on 76.

Another solution is to replace the thermostat.

Charlie

Go Here: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

consider a switching relay

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