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

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After filling oil tank, turned heater on. does not shut off at 70, keeps running. have to shut heater by emer. shutoff-bad thermostat

Heating only

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  • 20 Answers

Here is the user manual for your unit.
https://www.manualowl.com/m/Honeywell/CT87B/Manual/134033
Look at parts 7&8 of the manual. In section 8 there is a notation about the anticipator pointer adjustment that should solve your problem.

Posted on Nov 22, 2014

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Posted on Jan 02, 2017

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SOURCE: oil filled heater wont stay on

I was having the same problem and did a search to find this link. This morning when I turned it on, I backed the temperature down to 66 when it first came on (defaults to 70) and it appears to be working now (it's been on for over 10 minutes)

Posted on Dec 18, 2008

  • 5 Answers

SOURCE: heater won't blow heat and keeps running

first try to pull out the little white button on bottom left side. if it is already pulled out, then take cover off, lightly press on the center dial as you adjust the little adjusters that are in the dial. should be two of them, the first should say off set to 90, second one says on set to 130or 135. these steps may work. if not then one of the wire connections may be loose.

Posted on Apr 26, 2009

  • 5 Answers

SOURCE: day and night heater and a/c unit heater would go

first try to pull the little white button out, it is a manual control button, and the out position is auto. If that does not work try taking off the cover, lightly hold the dial down while you adjust the settings. they are on the side of the dial, first setting is the off pos. set to 90, second is the on pos. set to 125-135. then put cover back on, while being careful not to push the button in.

Posted on Apr 26, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: the thermostat although programmed to heat to 70

Are you confident that it is the thermostat? I would first try would be to disconnect the wire on the R terminal of the thermostat and see if the heating system stops. If it does, then you have confirmed that the thermostat is in fact the issue. Replace it. If it continues to run on, you have a problem with the wiring or control board of the heater.

Posted on Feb 24, 2010

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