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How can I test and troubleshoot a Honeywell S8600M control module.My furnace has no spark at pilot,All fans run when calling for heat.

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: New honeywell thermostat on new gas furnace not working

sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1

Posted on Nov 12, 2008

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SOURCE: Oil furnace fan on all the time

who cares

Posted on Feb 06, 2009

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SOURCE: honeywell s861ou 3009 intermittent pilot module

What is the wire on the old control.....what terminal is it on??....When replacing old controls the new ones often have different terminals and sometimes incorporate some terminal internally etc....the Wiring Diagram included should be followed exact....if it's working fineit's likely ok....if you have any doubt have it looked at by an expert

Posted on Oct 26, 2009

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SOURCE: new thermostat honeywell RTH7400 cycles oil furnace every 10 min.

rth7400 maintains a 1 degree differential in temp so 10 minute cycles are not unusual.


Posted on Dec 24, 2009

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SOURCE: batteries died on my honeywell RTH230B replaced but furnace won't

you will have to reprogram it according to the operating manual.
The manual is available on

Posted on Feb 02, 2010

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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

If you need further help, I’m available over the phone at

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

1 Answer

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.

Nov 18, 2013 | Honeywell Power Humidifier: Furnace...

1 Answer

Have old Carrier standing pilot furnace. Furnace calls for heat, but blower does not come on for almost 1 minute. How can I make blower some on sooner??

If it has a honeywell fan control, the cover can be pulled off and the setting can be lowered by adjusting the small lever on the dial, if it is a timed control it probably has no adjustment unless it was replaced with an adjustable fan control.

Oct 30, 2011 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

On call for heat gas comes out of pilot. there is no spark from spark ignition.

You're probably looking at a spark ignition control module.

How we test for this failure is by making sure the wiring is correct stem to stern. Follow the schematic exactly.
Then put the system into a call for heat.

If the spark wire doesn't signal on a multi-meter when it calls for heat, you'll need a new module. A failure to spark.

There will be a "signal" from the spark terminal ON THE MODULE, on a call for heat, if the module is working weather there is a spark rod connected or not.

The module will try to spark, even if there's another failure in the pilot system, such as a bad gas valve. But only if the wiring is right.

Remove the rod, then clean the ignition rod with a green scrubby pad, be careful it's sensitive. Most scratches won't hurt anything.
myairfixer_1.jpgSome models call for a "gap" between the rod and the pilot hood. Correct that too.

Put the rod a little closer and restart.
When there is spark, you will see it, especially in the dark.
VERY SENSITIVE ROD. Ceramic cracks easily.

Wonder what would happen if you lit the pilot with a match on call? Because if there is a pilot flame, and the sensor won't signal back, the sensor is bad. Then replace only the sensor / spark rod with the wire.

There is a millivolt test for the sensor, listed in the mv rating on the furnace and / or module specs.

Hit the sensor with your bic lighter. If you can use a multi-meter.

But unless you see that the rod is burned, deteriorated or otherwise damaged, they don't go bad often.

One last warning;

Dec 23, 2010 | Dayton (3E379) Heater

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

Honeywell s861ou 3009 intermittent pilot module, i just installed this control on my furnace. I have one wire left from my old johnson control. this wire either goes to the draft fan or the burnham logic...

What is the wire on the old control.....what terminal is it on??....When replacing old controls the new ones often have different terminals and sometimes incorporate some terminal internally etc....the Wiring Diagram included should be followed exact....if it's working fineit's likely ok....if you have any doubt have it looked at by an expert

Oct 21, 2009 | Honeywell Electronic Programmable...

1 Answer

Pilot light will not light

Sounds like you may need a new electronic control module. This is a rectangular shaped plastic box that has wires coming out of it. This is what tells the pilot to light on these older furnaces.

Jan 25, 2009 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

Furnace will not heat.

Most of the Lennox G-16s that I have repaired were having problems with the gray Penn-Johnson Piggyback igniton control module.
This is best repaired by replacing the spark module. Sometimes it may be neccesary to replace the gas valve also. Lennox updated to a ROBERTSHAW ignition system. Honeywell can also be used.
Also check that there is no water in the pressure switch or tube.
Hope this helps.

Jan 13, 2009 | Honeywell Electronic Programmable...

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