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ok fist thing is to press and hold the middle lower button and the arrow up at the same time and hold until the screen changes to a number. keep hitting next until you see 75 appear then arrow up to the temp you want and press done. That easy!
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.
Where are you measuring the indoor temperature?
To compare it to the thermostat temperature you have to measure both temperatures at thermostat.
The thermostat will only control the temperature at the thermostat, not any where else in the room.
The room temperature depending on insulation in walls and ceiling and distance from outside wall and outside temperature, can be as high as 10° difference from outside wall to inside wall of house.
The lower the outside temperature, the greater the room difference in heating. The higher the outside temperature the greater the room difference in cooling.
do you live there? if so here are the rules for setting back temperature: do not lower the temperature more than 8 degrees F from the temperature you want it when your there, setting it back for periods of less than eight hours is also somewhat futile. Due to laws of thermo-dynamics the heat required to recover from more extreme setbacks or shorter periods of time exceeds the savings acquired by taking said action. As to your question directly there are no reasons why your thermostat should not function at any setpoint temperature that it is allowed to set to (45 normally being the lowest) if it does not function below 58 degrees it has a failure and should be replaced before it fails completely. Suggest a Robertshaw or Braeburn brand thermostat, Honeywell quality has slipped over the past decade to unacceptable levels. Unless your considering a Hunter in which case buy another Honeywell.
It sounds like you might have the same problem that we have. I read the manual and it says that thermostat has a special lock to prevent tampering. It could be locked. If you override it only last a while and goes back to its original settings. The manual says you need to contact the person who installed it. In our case the person who was in charge when when we had it installed is no longer with the company. We don't know who installed it.
Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.