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I have a 1F81-51 White-Rodgers thermostat that
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.
on Mar 20, 2020
My thermostat resets itself
BE absolutely sure the batteries are good. This is what usually causes this symptom, even it the 'battery indicator' isn't asking for a new battery. It happens a lot on systems that are being turned off with the breaker, safety or service switch; DON'T do that. When you put a set of brand new alkaline or lithium batteries, with the thermostat off the wall, leave NO batteries in it for about an hour. Be sure that the power is on 24/7 to the system. To stop the system from running, always use the "Heat--Off--Cool" switch.
on Nov 02, 2017
Filter shows up in window. I just put a new one in
Press and hold the filter button for 15-20 seconds to clear filter notification. Some programmable models allow you to change the interval of the filter notice. This is only a filter check reminder for a set period of time, it does not indicate the filter condition at all, just to remind you to look at the filter to see if it needs replacement or cleaning.
on May 28, 2015
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