Question about Honeywell Programmable Thermostat Heater

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Zone valve on my Burnham gas furnace keeps running hot continually. How do I manually shut it off? All wires look good and are connected. The other 2 zones work fine.

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ASSUMING THAT YOU HAVE HOT WATER SYSTEM,IT IS TIME TO THINK ABOUT REPLACING THE ZONE VALVE.IF YOU DISCONNECT THE ZONE VALVE,THAT AREA WILL NOT GET
ANY HEAT.IF YOU CAN GET THROUGH REST OF THE HEATING SEASON WITHOUT IT,TURN OFF THE POWER TO THE ENTIRE SYSTEM.THEN DISCONNECT THE POWER SUPPLY TO JUST THAT VALVE.BE CAREFUL TO PUT WIRE NUTS ON ANY EXPOSED BARE WIRES.YOU CAN THEN RESTORE POWER TO THE MAIN SYSTEM.

Posted on Mar 07, 2009

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The 2 flashes on the screen and the furnace will not turn on. The 2 indicates the time frame program which is correct but why flashing? Owners manual does not address.


I had two flashes on a Honeywell 8670 continuous retry controller to my Burnham power vent natural gas furnace.In my furnace the two flashes meant the last attempt at starting failed and it was going to retry in 90 seconds.

In my case the furnace actually had two intermittent problems with similar codes. The first issue was the high voltage pilot light cable was also a combination flame sensor wire. The cable was supposed to clamp on to the pilot assembly like a spark plug wire.

When it was installed the clamping bits were too far apart and some fool decided since it wasn't sticking he would glue it on. This worked initially, but later the connection was only good enough to pass the high voltage not the low current DC signal back to the controller indicating the flame started successfully. Flames conduct a small amount of electricity due to ionization and the controller senses this.

I pinched the clamping bits together with some pliers. Then it fit tight and kept working.

Other reasons for the 2 flash code on my controller might be no gas or pilot light failure.

My other problem was a partially failed capacitor on my power vent motor caused the vent fan to run in reverse on say one in one hundred start attempts. Once it started running in reverse it wouldn't run forward without stopping it completely, which took several minutes of off time. The capacitor was available quickly and inexpensively from McMaster Carr.

Jan 10, 2015 | Heating & Cooling

2 Answers

Model sf35f furnace wont quit heating after reaching thermostat setting


Sounds like the heat anticipator in your thermostat is either bad or out of adjustment. Turn of the furnace power. Remove the thermostat wires from the thermostat. Turn the power back on. Connect the white and red wires together. The furnace should start up. Let it run a couple of minutes. Then disconnect the wires. The burners should shut off immediately. The blower will continue to run for 60 to 360 seconds then shut off. If this happens replace your thermostat. If the burners continue to burn, then your problem is either the furnace or the thermostat wires.

Sep 12, 2014 | Heating & Cooling

1 Answer

Replaced a sv9541 with a sv9641. Gas continuously runs through the ignitor assembly, have to turn the gas off to the furnace to stop it. Works fine when furnace is running, just won't shut off when th


If the gas valve is reversed the gas will flow freely. Make sure it is facing the right direction. If that is good then I would check for power to the valve. If it is energized constantly then it will flow freely. My best guess is there was a wire misplaced and your pilot is energized. Check the wiring diagram and trace the wires to. Confirm.

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1 Answer

I have a Weil mcLain Gold gas furnace and the Amtrol WH-7L hot water maker. I heat alot with an indoor woodstove and if the furnace is not being used I cannot get any hot water. However, when the furnace...


You should download & review the manual for Amtrol Boilermate products here.

Page 12 of the manual begins examples of wiring between the Boilermate and aquastat (also gas valve and multi-zone relay), that is usually mounted on the boiler. In order to use it correctly, you'll need to determine which aquastat (or other device) your furnace has. You should be able to locate this info on the inside of the aquastat cover. The Honeywell Triple Acting aquastat is very common and looks like this:

11_29_2012_7_17_38_pm.jpg
The cover is held by a single screw on the top, bottom or front (depending on the model you have). The inside should have wiring information along with the model number. Compare the model number with the wiring diagram for it in the Boilermate manual.

Make sure power is OFF before continuing.

Check that all wires are terminated and undamaged. Make sure terminal screws are not loose. Tighten any found to be loose.

The orange wires are connected to a switch that is normally OPEN but CLOSES to start the boiler when the hot water has cooled. It is also used to operate a "power vent" for a minute or two both before ignition and after flame out for safe pre and post purging of the combustion chamber of furnaces that lack a chimney.

Blue wires are connected to a switch that is also normally OPEN but CLOSES to start the boiler when the hot water has cooled. When the switch connected to these wires is CLOSED, ignition happens instantly. There is no delay for purge so when these wires are used to start a furnace, it should be one with a chimney - not a power vent.

For additional help with your particular installation, you will need to provide information concerning the wiring diagram in the manual that applies. Otherwise, there are simply too many variations to walk through.

I suspect that the switch(es) that are connected to the orange (or blue) wires - or the device (aquastat or multi-zone relay box) is not operating as expected to start the furnace.

The troubleshooting section of the manual that seems to apply best is the section: Boiler will not operate when calling for hot water on page 27 (if you want to try some of their suggestions while waiting for additional replies).

I hope this helps..

Nov 29, 2012 | Heating & Cooling

1 Answer

Robertshaw thermostat will not shut off heat


gas or electric furnace? sounds like bad sticking t-stat but could be sequencer or gas valve. The fan will continue to run if the unit is hot safety feature so the fact that the fan continues to run does not mean the t-stat is diffidently bad.

Mar 01, 2012 | Heating & Cooling

1 Answer

I have a model GMP075-3, S/n9509835876 that will not lite the gas. The blower does come on for awhile then shuts off for several seconds and trys to restart. I can smell gas at the furnace while the blower...


Unplug your quick connect at the ignitor and chek to see if it has continuity. If it checks good start the furnace and see if you have voltage present at the quick connect. If ya ain't got volts going in then their is a problem with the board. Rich has a nice video at HVAC for beginners HERE

Oct 29, 2011 | Goodman GMS90703BXA Heater

1 Answer

Have a Fridgidaire GR6C-080C-16 furnace that runs for a few minutes then gas supply is cut-off. Furnace will then re-start and the run through it's pre-cycle, just as if the thermostat just called for...


It sounds to me like you have problems with the gas valve as you have eliminated pretty much everything else. I would check all wiring to valve,check for any breaks on the insulation and clean all connections.
When the burner goes out is the blower still running or does it quit then the burner go off? If that is the case I would think the thermal overload on motor was tripping. It makes me more inclined to suspect the gas valve due to the lack of any diagnostic code.
One other thing I would try is to check power to gas valve when burner is firing and see what it does when it cuts out.If it maintains power when gas shuts off then I would replace gas valve. Good luck and thank you.

Feb 14, 2011 | Heating & Cooling

1 Answer

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Sounds like the flame sensor is dirty or bad. This is a metal rod that sits on the flame telling the controls that the burners is lite and it is okay to keep the gas valve open. If there is no flame it tells the control no flame shuts the gas valve off to keep excess gas from building up in the furnace. It could also be a faulty limit switch which tells the control the furnace is to hot so shuts the furnace down till it cools off. This is easy to check with an ohm meter with the furnace off check for continuity through the switch(usually a round disc looking thing with two wires going to it) if it ohms out then it is okay then run the furnace and after it shuts off check the switch to see if it ohms out if not then you have found the problem if it is okay could be the flame sensor try to clean it with a lit grit sand paper or emry cloth works good.

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2 Answers

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What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control). When all else fails, check the ground connection for corrosion.

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1 Answer

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Feb 28, 2009 | Honeywell Programmable Thermostat Heater

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