Question about Honeywell Programmable Thermostat Heater
Last year my Coleman gas furnace would not stay running (the electric blower motor would not stay running). The unit has some age, so I pulled the blower motor out to inspect. It looked old, so I replaced. The same problem occured (frequent cycling on and off of blower motor). Next, I repaced the old Thermostat with a new Honeywell (analog type- # listed above). I also replaced the thermocouple with a new one. This solved the problem.
I just prepared the furnace for a new season (cleaned burner area, filter, inspected area, cleaned thermocouple with alcohol (pilot light had been on throughout the summer), and then, turned the gas off, waited 5 minutes and started the lighting process. The furnace lit up fine. I then increased the thermostat and the main flame ignighted. The blower motor started up in a short time, but then cycled off again. It began acting in the same manner as last year (cycled on and off). I noticed that when you touch, or bump the thermostat, I hear a click in the furnace area. This must be a device in the furnace area that closes contacts, to complete the blower motor curcuit. I'm thinking it may be the thermostat, or possibly the thermocouple.
What do you think?
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Posted on Jan 02, 2017
You probably have a loose or broken wire to the fan relay. Check the wires on the thermostat first. Pull up on the bottom of the thermostat to remove it from the wall plate. You should see several screw terminals and the conductor wires that should be connected to them when you look at the wall plate. Check if any of the wires are disconnected or broken. If a wire is broken, strip a portion of the unbroken section of the wire and secure it to the appropriate screw. (The fan relay terminal is G for most setups.) If none of the wires are loose or broken, then you have to check for damage to the wires between your heating system and the thermostat or at the heating system. It could be a bad wire going to the jumper on control board or damage to the board itself.
I hope this helps. If the problem is not at the thermostat, you may need to have a professional diagnose and fix the problem. However, if you post additional comments about your heating system, Fixya experts may be able to help you diagnose the problem.
(we had the broken wires at the thermostat keeping the fan from working in the past. It's an easy fix if you are willing to handle small wires carefully.)
Posted on Jul 06, 2013
Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?
Posted on Nov 02, 2013
SOURCE: round honeywell thermostat
Sounds like you have a T86 thermostat...take the round front cover off to view the Mercury switch. Watch the bulb when you change the temperature to a higher setpoint. If the bulb makes contact when rotating it up, and the furnace doesn't go into a call for heat, then it could be the thermostat, wiring, or furnace problem.
Posted on Dec 15, 2013
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