My thermostat resets itself

The Peco TA-170 thermostat is designed to control both heating and cooling, and it appears that it may not allow for separate temperature settings for heating and cooling. However, you can adjust the set point temperature for both heating and cooling modes at the same time by following these steps:

1. Press the "SET" button to enter the programming mode.
2. Use the up and down arrow buttons to adjust the temperature set point. The display will show the current temperature set point for both heating and cooling modes.
3. When you have set the desired temperature, press the "SET" button to save the new set point.

To reset the thermostat to its factory settings, follow these steps:

1. Press and hold the "RESET" button for three seconds.
2. The display will show "RST", indicating that the thermostat is resetting.
3. After a few seconds, the display will go blank and then turn back on, indicating that the reset is complete.

Please keep in mind that resetting the thermostat to its factory settings will erase all programmed settings and return it to its default settings. You will need to reprogram the thermostat to your desired settings after the reset.

Hi,

To operate it manually, you'll need to review the steps in the manual to turn off the automated settings and update the default temperature as well.

Thank you.

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.)

possible problem thermostat or freezer setting to close to one setting
reset to a bigger number as the numbers work opposite to the fridge settings ( 1 is close to 0 degrees and 20 is -20 degrees ) where as in a fridge 1 is close to 0 degrees and 5 is + 5 degrees above 0

am having the same problem, and same circumstance. Did you find a solution?

If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.
SeagullAC

Since it's within 2 degrees of your setting it could be one of two things. Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off.
If the temps are both the same, the furnace thermostat is fine.

If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

I had the exact same problem. Even pressing the Hold button does not really help, because once it resets - the Hold temperature also changes to the default.

I fixed this by replacing the 470 micro-Farad / 10v capacitor in the unit (it's the grey-colored capacitor). To access the back of the circuit board, you will need to break 2 plastic rivets holding the front of the unit to the base.

After replacing the capacitor I've not had any resets for the past 3 days (it used to reset itself every couple of hours).

Hope this helps.

Noel

To manually operate the thermostat set the system to cool and fan to auto then press the HOLD button one time then release, you will see the hold word on the screen after that up the UP or DOWN arrows is setting the desired temperature.