[DIY] Inaccurate Thermostat Temperature

 

Digital thermostat for AC/HEAT (about 10 years old).  It's reading the temp incorrectly.  I don't know what the actual temp is but initially I estimated that the reading is at least 10 degrees higher than what it should be reading.  ...and I think the gap has widened within recent days (as a matter of fact, as of the last reading it was apparently 110 degrees or "10" since there isn't room for a 3rd digit).

I've checked the batteries.  They still have juice in them (plus the change battery indicator isn't showing) and there are no signs of leaked acid.  I've "reset" it a few times but the temp climbs right back up to the incorrect reading.  I see no signs of dirt or dust in the unit.  This thermo's temp can be manually changed but the differential is only by 4 degrees up or down and I'm sure it's well above that mark.

My question.  At this point, I'm going to assume the thermo has gone bad (but please tell me if there is something else I should look for).  I don't care what the reading says.  I'll keep it so long as the AC or Heat kicks on at the correct temperature.  Meaning....please tell me whether this would be the case or not....

Let's say the actual temp inside is 70 degrees but the unit states that it is 80 degrees.  Now, if I set the heat to kick on at a thermostat reading of 82 degrees (2 degrees above the thermo readin)....will the heat actually pump out at 82 degrees or will it pump out at 72 degrees (2 degrees above the actual temp)?

I guess I'm not sure if there is a secondary measure of temp in the central air unit or if all measures of temp are read and sent strictly by the thermostat.

...on a side note, is there a reason why thermostats don't allow you to start the heat or AC (not the fan) at any particular temperature (as oppose to only above or below the actual temp). 

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Posted by: subprong <subprong@gmail.com>

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