Room Temperature Way Above Set Temperature


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Old 10-24-13, 09:14 AM
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Room Temperature Way Above Set Temperature

Hello everyone! Thank you in advance for any insight you can provide to this issue. Now that the weather has turned colder here in Ohio (40 F. today) we have switched the thermostat from cool to heat. For some reason the inside temperature is way above the set temperature on the thermostat (set to 65-70 F. actual around 80 F. We have not previously had this issue in the past. Here are more details:

- Circa 1998 Lennox Natural Gas Furnace (not home so can't provide model)

- Single Honeywell Digital Thermostat about three years old. Replaced batteries, but did not resolve issue. Thermostat is located on an interior wall with no drafts, heat sources or sun hitting it.

-Recently replaced filter (within last month), but did not resolve the issue.

I was thinking about buying a replacement thermostat as a starting point, but wanted to get some feedback before proceeding. In case it could be something else.

Again, the house is much warmer than the set temperature. Decreasing the thermostat temperature appears to not really have an affect. The furance does not run constantly though it kicks on and off and the thermostat clicks on and off as well. Any ideas?

Thanks!
 
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Old 10-24-13, 11:06 AM
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Decreasing the thermostat temperature appears to not really have an affect.
It definitely sounds like a thermostat issue as that is what controls the point at which the furnace comes on or shuts off. Thermostats do go bad mostly the internal relays.
 
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Old 10-25-13, 04:40 AM
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Thanks! I discovered that a portion of the interior wall behind the thermostat was much colder than the rest of the wall. I had installed some lighting in the attic this past summer and had not replaced the insulation when finished, which is causing a lot of cold air to flow down behind the wall and behind the thermostat. Thankfully this is an easy and inexpensive fix.
 
 

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