I've noticed several times this winter my heater not being on when it
should be. My round Honeywell thermostat is set at 70 and this morning
the thermometer read 64 (heater was not on). On these occasions,
I "fix" the problem by placing the thermostat switch to OFF and then
back to HEAT. The heater kicks on and warms the house. Is this a
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I have a honeywell CT2700A1019. The themostat is set at 66 and is reading 57. The blower is blowing but the air is cold.
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It sounds like you may have a round Honeywell thermostat. It could be that the temperature pointer you see on the face of the thermostat just needs to be adjusted. The next time your furnace or AC finishes running, remove the face off the thermostat and use a small screwdriver to set the dial so the pointer temp matches the other temperature indicator.
The thermostat that you have is position sensitive. By that I mean that you need to have it in the right position for it to work correctly.
When you have the ring off of the thermostat loosen the two little screws and pull the thermostat away from the subbase. On the subbase you will see a line that needs to be level. If it is not level then the mercury bulb will not be in the right position to start and stop the furnace. Level the subbase and reassemble the thermostat and your furnace should start to work properly. If not then the thermostat is probbaly bad.
When they go bad it is often becasue ot the little arm that you refeered too. That is a small heater than actually fakes the thermosat into thionking that it is hotter in the room then it really is. This makes the furnaces shut down a bit early to combat overshoot. Adjusting that will determine how much time before the furnace hits the shutdown temperature that it will actually shutdown... got that?? In others ward it is probably a good idea not tp mess with that unless you know what you are doing. However the heater can burn out and create problems.
So, check that the thermostat is level and if not get a new t-stat...
I hope that this will help you to solve your problem!
If you tip the mercury switch so that it makes contact and the furnace
doesn't start, it isn't the t-stat. Check the connections, then
start checking the furnace.
In any case, ditch the mercury t-stat (recycle it properly) and get a
new programmable one if at all posible. It will pay for itself
many times over by turning your heat down in the middle of the night
and back up by morning.
The honeywell tradeline thermostat would work as a direct replacement (no mercury in the new ones), however if your using just heaters and no cooling system off of it, you could Heat only thermostat from honeywell that would replace your unit as well. Both at available at Ace Hardware with the heat only unity being roughly 7 dollars cheaper.