It’s best to think of a basic thermostat as a temperature limiter. This problem is related to thermostats because if the thermostat is set to a lower temperature then the water won’t heat as much as you would like it to. The reason for that is simple: a thermostat has no control over how quickly your house heats up; all it does is set the final temperature for your comfort level. My A/C unit is set to cool to 72 degrees, but the thermostat continually says 80 degrees. Reply to Thread Reply. During a cold winter spell for example, you might set the temperature to 85 degrees. Heat temperature doesn't reach thermostat setting. June 17th, 2012. The problem could require just a simple fix of a quick setting change. If your furnace is too small for your house, then it will work constantly and never raise the temperature up to where you have set the thermostat. For example, I had it set for 68* when I woke up this morning, when I checked the thermostat it said the temperature … It doesn’t know to … You will see a different display number come up that corresponds to the temperature you set. Remember that your entire heating and cooling system depends on temperature reading from where the thermostat is placed. Or is there a heat sensor problem? My furnace won't heat my house to the temperature the thermostat is set to. It's a couple of years old and has worked fine until recently. If your thermostat fails to reach the desired temperature, one or more of these sensors could be broken or damaged. Thermostat Temperature Set Too High or Too Low Problem. You are not satisfied with the way your thermostat controls the temperature in the room and noticed that the actual temperature does not match the one you’ve set on your thermostat? On your thermostat: Go to the schedule screen on your thermostat. 5. Kenmore Elite model 253.26752100 has worked perfectly for about 5 years. I apologize if this question has been asked before but here goes. On most occasions, the whole thermostat is replaced. I have set it for 21 degrees. Check to see if your thermostat is properly programmed to heat or cool your home depending on the season. The thermostat will now display the DAY set point time and temperature. You will likely hear the system click as it engages and turns on the air conditioning to lower the temperature in the house to what you have set. Having a furnace that is too big for your house can also be a problem. Periodically I would check the vents throughout an hour and a half to two hours' time, and it was still running. Lately (especially on really cold nights) the house will not heat properly and we wake up to a freezing home with a temperature in the low 60s. 1st, 2nd and 3rd gen Nest Learning Thermostat: Press the ring and choose Schedule . For cooling at 72º with a span of 2, your air conditioner will activate at 73º and shut down at 71º. share | improve this question | follow | asked Oct 8 '13 at 19:44. Unfortunately, fixing a damaged sensor is pretty tricky. Has been like this for 2 days. Heating thermostats work by monitoring the average temperature of your home and sending a signal to a boiler to ensure it’s never too hot or too cold. Show Less. Answered in 2 hours by: 1/11/2008. Then we noticed about a month ago that we set the temperature to 21deg, (which has always been) all the RADs heated up ok, but the temperature wont go above 15deg. Any … Set the thermostat to a temperature that your heating and/or cooling system won’t reach, in case you don’t want it running while you’re out of the house. The heater kicks in but shuts off when the room temperature needle hits 65. To heat to 78 degrees or fails to reach the desired temperature, whole... 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