Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
My gas furnace is constantly turning on (2 minutes) and off. Is there some kind of setting (maybe the delay setting) that I need to change so that it will stay on longer.
This can't be good for my heating bill and I know it's not good for the comfort level in my home.
Is this truly a T-87 round mechanical or is it the new electronic version? If it is gold in color it's the old tried and true, if it's white it could be either. Pull the outside ring straight out. If it is a t-87 mechanical you will see a mecury bulb setting on a spring on top. On the lower righ (4 to 5 o'clock) is a heat anticipater adjustment. Take the brass poiter and slide it to the left as far as it will go this should increase the duration of cyles and make them less frequent. This is if the problem is truly thermostat related. If it is the electronic version of the T-87 and it displays this behavior only when it is very cold out, it is a programming glitch that they were informed of 2 weeks after it came out, because I told them. If this is what you have purchase a new thermostat and replace that junk that is defacing your wall.
Posted on Dec 18, 2008
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Posted on Jan 02, 2017
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Hello, First of all I need to know a little more information. What kind of furnace do you have? Gas or electric? One thing you may do to eliminate the thermostat is to take off the front cover of the stat and jumper the W and R terminals to determine if it is the stat or the furnace. If you do this on the stat and the unit heats up and stays running then you have a bad thermostat. If this does not make the furnace stay on then you have another problem. ( be sure to turn off all power to the furnace before you start working on anything) Please supply more information for further help. J
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