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Trying to restart a Coleman Oil Furnace Model 8870A. It appears I am getting good ignition but the main burner just will not light. Already tried cleaning the ignitor leads and have been experimentin

Trying to restart a Coleman Oil Furnace Model 8870A. It appears I am getting good ignition but the main burner just will not light. Already tried cleaning the ignitor leads and have been experimenting with the adjustment for air... Any ideas?

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  • Contributor
  • 13 Answers

Can you see fuel spraying across the ignitor?

Posted on Nov 26, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

jcpark50
  • 52 Answers

SOURCE: Manual for a Coleman Forced Air Furnace manual

If you haven't already tried Coleman customer support, try Google. You can find owner's manuals for all kinds of things. good luck, John

Posted on Nov 07, 2008

  • 306 Answers

SOURCE: Coleman Propane Furnace Good pilot light but feed/ignite main burner

If you have a volt ohm meter take the two leads off the gas valve and ohm out the connection should have resistance for the coil. You said you have 12 volts from the thermostat white and red in the heating mode you should have minimum 26 volts. If you want to check the transformer should have 28 volts. Almost sounding like the transformer is getting weak. You can get parts for a 20 year old unit at any HVAC parts house. Try Washer Specialties here in Wichita Kansas they are on the web. Lowes even carries Transformers. Has to be rated 120 volt primary side secondary side 24 volts and 40 VAC.

Posted on Nov 24, 2008

  • 2461 Answers

SOURCE: main burner will not ignite Tempstar(NTC5075BFD1)

try cleaning the pilot oriffice it sounds like the flame is weak

Posted on Jan 17, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: my furnace tries three times then red light blinks once

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).

Your furnace has a diagnostic chart on the reverse of the lower panel incorporated in the wiring diagram. One blink tells you that it is a failure but wont tell you where to start looking.

Posted on Nov 28, 2009

  • 77 Answers

SOURCE: r7184b just got oil reset wont reset tried main

if the reset is a square button see if this will work. hold the button in, the green light will go out, count to 30 by 1000s, (1001-1002-1003 etc.) at around 1030 the green light should flash once. when it does release the reset and wait about 10 sec. the pump should start. if it runs for about 15 sec. and shuts off the pump needs to be bled. good luck, hope this helps.

Posted on Jan 22, 2010

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Manual for a Coleman Forced Air Furnace manual


If you haven't already tried Coleman customer support, try Google. You can find owner's manuals for all kinds of things. good luck, John

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