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Honeywell Chronotherm 8600 series Problem

I have a Honeywell Chrontherm electronic programmable thermostat. It had been working fine until last week when it began to fail to turn on the heat. You can hear a clicking sound as it attempts to turn on but fails. It is also part of a 3 zone system so the other thermostats turn on the furnace just fine. Any help would be appreciated.

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SOURCE: honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...


Posted on Mar 07, 2008

Accurate Joe
  • 61 Answers

SOURCE: replacing aging erratic honeywell chronotherm III

Honeywell has a great newer thermostat.

This is what I sell, it is easy to program and use and has a large touch screen. I hooked up 4 in a office and it saved them 15 % of heating bills this is the link for Honeywell thermostat for the page.

Posted on Nov 30, 2008

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SOURCE: On our honeywell trolatemp universal minizone zone

sounds like a furnace problem - the zone control sounds right

Posted on Oct 08, 2009

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SOURCE: my honeywell programmable thermostat chronotherm

Hi, if this thermostat has batteries, try and replacing them. It sounds to me as though the circuitry in the sub-base has a problem keeping the stat programmed. Shutting down with in 30 seconds and back on only to shut off again tells me that the sensor that is a part of the circuitry on the sub-base that senses the rooms temperature, has failed and it cycles on and off. If it does have batteries, change them to see if this solves this problem. If no batteries, shut the power off to the a/c and remove the cover to the stat. If this does not expose the control wires, you will have the stat sub-base to remove. It will have several small screws that will need to be loosened to get to wiring. If your system has a gas furnace or electric heat and not a heat-pump, you will have terminals marked like this. RH, RC, with a jumper wire connecting the 2, W white for heat control, G, green for fan control, and Y, yellow or they may have used blue for cooling control. You can pick up a new programmable thermostat at Home Depot, Lowe's hardware for this for around $30. It will come with the Red jumper already wired in and this is where you connect your existing red to either one, but leave this jumper on. This will solve your problem. If you have no gas furnace and it is a heat-pump, it will have many more wires and terminals such as this, R, W-1, W, E, O, B, Y, C. Draw your self a diagram on the wire terminals and colors of all wires and what terminals they are connected to so you get it right and take this along to match it with the correct heat-pump thermostat. Honeywell has good dependable stats, so try and stay with them. If the price for one is off the wall, go with a White Rodgers, Hunter, Carrier, and just look them over good. Read to see if they have batteries for the display and if they are included with the stat. This will solve this problem. Please don't forget to rate me on this as I know you will be kind. I will be checking in to see how you are coming along and if you need more help as I will be here.
A/C, Heating, & Refrigeration Contractor.

Posted on Aug 30, 2010

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SOURCE: Our Honeywell programmable thermostat is

Good Morning, and yes you said it. Anytime a stat doesn't come on when it is set for a call for heat or cooling, the sensor on the subbase of the stat has lost its ability to sense the correct temperature. I have seen mechanical stats last as long as 25 plus years, but that's truly amazing for a digital stat to last that long. Yes, replace the thermostat. I don't know what kind of system you have, but if its a gas furnace with an a/c, the wiring will look like this. You will have terminals marked R, Red, for the 24 volt hot wire, G, Green, Y, Yellow, and W, White for heat. Going back to the red wire, it should have RC and RH on it. There will be a normally red wire connecting the 2 terminals.The Red wire coming in can connect to either one, as they are all together. The new stat will come with the new Red jumper wire attached. So, if you do have a gas heater, this is very easy to install. The only terminals you will need to use are RH to RC for the incoming red, Y, G, and W for heat. Y is for cool, and G is for fan. Very easy. Now if you have a heat-pump, they have many more terminals and can be a problem wiring them. If you have gas, forget the heat pump. I wont confuse you by going there. If it is a heat-pump, contact me in the comment box to let me know, and I can help you there also. Get a new stat at Home Depot, Lowe's Hardware, or O.S. Hardware. You want a 5 day, 2 day programmable Heating and cooling thermostat, 24 volts.It will have everything you need. See if it takes batteries for the display, they may not come with those, it will say on the box. Turn off your power to heater, so you won't short out the new one.They come in 2 sections, first the stat that just snaps on, and the subbase that is screwed to the wall. It will have the wiring terminals on it. Remove a couple of screws and loosen wires and remove. Be sure you write down how the wires go in case they used different colors, you never know. You will be all set. Store the manual in a safe place for future use. I wish you the best.
A/C, Heating, & Refrigeration Contractor.
PS, Please rate me on this :))
Happy Holidays to you and family!

Posted on Nov 23, 2010

Testimonial: "I hate spending money needlessly replacing items that may not be the problem. Thank you for confirming my suspicions."

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SOURCE: thermostat won't keep furnace fan running

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.
Cindy Wells
(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

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