Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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We have a round thermostat made by Honeywell. I

We have a round thermostat made by Honeywell. I would assume it is from 1992 or thereabouts ... the temp is set at 70 and the heat doesn't turn on even at 60. We notice that there is a ''dial'' on the inside of the round cover that has a thin metal 'arrow' pointing where numbers are printed on a metal band. Is this the threshhold for upper/lower temps? And if so, how do you adjust it????

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Hi,
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!

Thanks for using Fixya!!

Posted on Dec 11, 2009

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Posted on Jan 02, 2017

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