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I have hill gas furnace with a Honeywell s86f intermittent pilot module.After the furnace warms up . The gas valve starts to open and close like it's calling for heat

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Check flame sensor is clean and air filter

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Not firing on


operation -call for heat 24 volt powers up control spark starts after all safetys close pv is energized pilot valve opens and pilot flame starts and proves flame sensor after flame is sensed mv powers up opening main gas valve as call for heat satisfied 24 volts shut off

Feb 23, 2014 | Honeywell Intermittent Pilot Module...

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Smart gas valve get 24v. but pilot will not spark or light


Do you have 24 volts at the gas valve terminals when the pressure switch closes?

Dec 17, 2013 | Honeywell Furnace Gas Valve Sv9501h2409

1 Answer

Does this valve have a standing pilot? if not, if my hot surface ignitor lights up and the furnace fails to light would you consider it to be a faulty gas valve? I am getting a constant 24 volts fro


If your getting 24 Volts to the gas Valve and the gas Valve is not opening replace your gas valve If your not getting a full 24 volts check your Transformer and the ground to the gas valve.If the gas valve still does not open change the Gas valve.

Nov 18, 2013 | Honeywell Furnace Gas Valve Sv9501h2409

1 Answer

When the heat cycle calls for gas there is no ignition is my gas valve bad?


I don't know what kind of furnace you have. But most furnaces have some sort of pilot first than after it is proven than the main gas will come on. Either a standing Pilot with a thermocouple. A hot surface ignition or Spark ignition with a flame sensor. Or a direct fire system where hot surface or spark ignitor start first than all the burners send a 1 sec blast of gas which is proven by the flame sensor if it proves the gas valve stays on.....
In what you have said you have 24 volts to the gas valve and it has not lite. then does the gas valve have a pilot tube???Does it have a thermocouple?? Do you smell gas?? If you don't smell gas then the main part of the valve has not opened. The Pilot valve has to open first and prove before the main gas will come on. I hope this helps. If you still need help repost with the name and model # of the furnace.

Nov 18, 2013 | Honeywell Furnace Gas Valve Sv9501h2409

2 Answers

My furnace does not start every time the pilot lights then it shots off. I believe that it might be the honeywell module S8610M3009. I verified both of the sensors. any input is greatly appreciated.


Not knowing what brand or model of heating system you have makes it somewhat difficult to troubleshoot but knowing that you are using an intermittent pilot control, may help us. If the pilot flame goes on and of frequently, you could have a dirty pilot orifice, a bad pressure switch, a bad inducer motor, bad gas valve, loose wire, hole in the pressure switch hose or a bad ignition control. Check for the obvious and clean and tighten what you can get to including the wires on the ignition control.

Jan 20, 2010 | Heating & Cooling

1 Answer

My furnace will not shut off on auto. the fan will not run when switched to on. what should I check?


Some new furnaces have a feature that when it has an issue, it starts the room air blower until you reset the thermostat or kill power to the furnace. Not knowing what you have for a system I can offer you only how a furnace works and what you could look for "generically".

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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).

Jan 18, 2010 | Honeywell Heating & Cooling

1 Answer

Gas Furnace Will not light


Hi, normally when you turn the gas off at the flex line valve and leave it off for awhile, the gas has to clear the gas valve and lines up to the pilot. Purge its self of air before it will light again. It will take the electronic ignition several clicks and more before there is enough gas to light the pilot and then open the main gas valve to fire the burners. Tell me, what kind of gas furnace is this when you speak of water? you say the site glass was full and you had to drain it and then the ignitor kept on clicking when it normally only took one click to light it. Please let me know the style as in a split system, a package unit, all in one, or what you have. I will wait to hear back from you. If the pilot does not light right away, then yes let it continue to click and see if it will light. On a heater with the electronic ignition control module on it or a circuit board, this is what tells the pilot coil to energize to light the pilot. It will send power to the pilot coil to open and let gas through to light and same for the main gas valve, will get a signal to open when the pilot is on. It will not open unless the pilot is lite for saftey. I will wait for you're responce.
Shastalaker7

Nov 27, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

Turn Thermostat to call for heat (here click)from the t-stat calling. I do not here the multiple click (ignitor)and then the flow of gas. I have a Honeywell VR8204M electronic gas valve. I have votage...


Wiggle wires, it could be something as simple as a loos connection. If your getting power to valve and it's not opening your valve is bad. Also check your limits somethimes all limits are connected and one broken one will throw the system off.

Dec 01, 2008 | Honeywell Heating & Cooling

2 Answers

Furnace gas pilot light keeps going out when windy outside


Honeywell makes an electronic ignition conversion kit. (White rodgers also has one but it uses a mercury switch which can be expense if it goes bad). A good service man can install the "Honeywell Y86 Universal Intermittent Pilot Retrofit Kit". This is a "complete" kit for converting a standing pilot system to electronic ignition. It includes a new gas valve, ignition cables with connectors. ignition module and a pilot assembly. It does not include pilot tubing (pilot tubing is cheap). This kit also comes equipped for either natural gas or propane. Your heating guys probably don't know about it because they are to young and not familiar with the old days. Or they just don't care and would rather sell you a furnace. I think that they just don't care. I live in Ohio I just opened up the "new" Johnstone Supply catalog. This part is "not" outdated its on page 450. Do not let these heating guys buffalo you into a new furnace. You are to smart for that! If you weren't you would have believed them and bought something you don't need. Instead of researching on the internet.
The bad news is this kit lists for $456. plus labor.
Good luck!

Nov 20, 2008 | Heating & Cooling

2 Answers

Heater won't ignite when heater is turn on.


See if the spark will arc across the area where the pilot flame is. It should cross the flame. Adjust the spark if possible.

Nov 11, 2008 | Dayton Heating & Cooling

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