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Furnace will turn on, but will  not ignite.  I have a Honeywell S86F module that I think is bad.

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Is your furnace a hot surface or spark ignition. If you have a hot surface igniter you can check it with a multimeter or pull it out and check to see if igniter has a break in it . Check igniter first even if you have a spark igniter. Some brands of furnaces you have to turn off the thermostat to reset. If you need anymore help send me the make and model# of your furnace

Posted on Nov 29, 2008

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Automatic pilot light wont light on a honeywell furnace


Honeywell is a controls company and makes a variety of auto-pilots. If this is a no spark problem,does the lead from the igniter go to a big PC board or a module. If a module, check voltage to the spark module or thermostat voltage to the ignition module. If it comes from a large board, the board may be bad. I'll need more Info. if this does not cover it for you.

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I have a Honeywell furnace model #M1MB 070A BW. How do I replace the igniter?


Hello, first turn off power to the Furnace, then remove igniter from bracket and unplug molex connector. Then take the igniter to a Hvac supply store and get new one, reinstall it into bracket plug into molex connector and turn furnace back on.

Mar 05, 2011 | Honeywell Heating & Cooling

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Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

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).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace does not turn on normally


Having to reset it tells me that there is probably an error code blinking on the control board. Look for a small viewing port that looks into the cabinet. Count the number of blinks then remove the panels to find the wiring diagram pasted on one of them. On the diagram you will find a diagnostic code to help you narrow down the problem. It could be as simple as a plugged air filter.

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).

Feb 07, 2010 | Goodman 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

2 Answers

Having problems with Carrier 58RAV furnace. Goes through the motions, but gas never turns on. I think it is a problem with the LPGS. Please advise. Thanks


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).

Dec 24, 2009 | Carrier 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

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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