Essentially the problem I’m having in my home is that my programmable Honeywell thermostat is set to 67, and the heat does not come on from my Trane unit until the temperature is well below 67 (sometimes it does not come on at all without manual intervention & the actual temp has gotten as low as 55). This problem is intermittent and sometimes works fine for days without this problem occurring.
When I notice that it is getting too cold in the house & it is 5 or more degrees lower than the 67 setting, I manually turn the power to “Off”, wait 30 seconds and turn the power back to “Heat”. If the heat does not come on within 1 minute, I’ll repeat the process & it usually comes on. Sometimes after turning it to “Heat”, I’ll increase the setting to 68 degrees, which usually seems to help (and it makes the “Energy Save” light turn off. I’m not sure the purpose of this light).
I’ve had it serviced & the technician indicated that when he opened up the HVAC unit to evaluate & test it, everything worked fine, but when he arrived he could see that the thermostat was well below the 67 setting. He thought it was likely due to the Limit having some rust on it, and thought it was not a thermostat problem. $200 to replace the Limit (parts, $120; labor, $80) & the problem still exists.
Any thoughts on what could be causing this?
How much should the temperature drop before the unit turns on, 1 or 2 degrees?