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Middle of night and neutral polarity lights are flashing on board ? It's cold quick fix for night ?

Herd furnace kick on , and pilot kept going out . It is windy out ,and I thought that was it until I opened door ,and saw code. Furnace is a 2010 or 11 Miller. Getting cold.

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: furnace won't stay running

Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
• Locate and correct gas
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
• Verify proper induced
draft blower performance.

Posted on Nov 25, 2008

  • 1 Answer

SOURCE: furnace code light flashes 3 times /pressure switch stuck open

Check the intake and exhaust plumbing for any obstructions. I had same issue, turned out to be ice in the air intake plumbing on outside of house. This may be the problem. The pressure switch can be tested by pulling hose from purge motor that goes to switch and applying a small amount of suction. The switch should make a clicking sound.

Posted on Jan 20, 2009

  • 3361 Answers

SOURCE: Loud noise when furnace starts but furnace won't come on.

Your fan delay relay has failed and must be replaced.

Posted on Feb 25, 2009

  • 53 Answers

SOURCE: My coleman floor furnace will not stay on

Have the thermocouple replaced, ensure the pilot flame is blue - not yellow, yellow indicates blockage in pilot

Posted on Oct 08, 2009

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SOURCE: 3 flashing light....Aire-Flo furnace AF80MPA100B5A

That control board is several hundred dollars. If I may make a suggestion, take a jumper and when the inducer fan starts, jump out the pressure switch. If it starts, it's not the board but a bad switch, hose or blocked exhaust vent.

Posted on Jan 15, 2010

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Actually, since the lights are alternately flashing, I guess it is the 1 Hour Lockout error message and NOT the L1 Neutral Polarity Fault. The furnace has power but the pilot will not light.

"Neutral Polarity Fault" means that the wire that's supposed to be connected to the "neutral" connection in the socket isn't connected to "neutral", but likely connected to power.

In the wiring, the "black" wire is "hot", white is "neutral"

Oct 27, 2015 | Heating & Cooling

1 Answer

Rheem furnace ,2nd green light blinks 5 times then pauses. I have only 1 furnace,not a twin

5 flashes is a "neutral polarity failure".
on the motor:
White is the neutral and must be plugged in to one of the 3 neutral slots on the control board (usually on the left side of the board)
The other 4 wires (black, red, yellow, brown) are power to the motor and should be connected to the appropriate pins on the control board.

Sep 13, 2014 | Heating & Cooling

1 Answer

I keep getting a reversed polarity signal on furnace.

Either you have a bad board, or current leakage between ground and neutral on the ac line. I have reversed the polarity on the black and white wires before and fixed it, but it's been rare.

Nov 21, 2013 | Goodman Furnace Draft Inducer Blower ...

1 Answer

Furnace won't kick in when thermosat is turned up. Was able to get furnace going by jumping wire on control valve , but it has kicked out in the middle of the night. Had a tech over to look at it and he...

If this is a High Eff. Furnace, sounds like the pressure switch is holding furnace out. Check to make sure Intake vent is not plugged. Make sure
that the exhaust vent is not getting backpressure from
windy outdorr conditions.

Jan 08, 2010 | Heating & Cooling

1 Answer

Gas furnace blower will kick on but burners not igniting. There is no gas leaking

Check to see that the pilot is lit if it is a standing pilot. If not check to see the the ignitor is glowing up or the spark ignitor is working when the furnace first trys to start. If it is a newer furnace check to see if there is a flash code in the bottom blower section on the board. There will be an led light that will flash a designated number of times depending on the problem. Once you have the code remove the door abd see if there is a chart on the back for the flash code.

Jan 06, 2010 | Heating & Cooling

1 Answer

My lennox furnace kicks on, then it shuts off

It should have a diagnostic set of leds on the board, with the code list on the door and the control board itself. If it get to the pilot stage and the shuts down its most likely the gas valve. You can check for continuity from mv to c on valve, you should have it. Then with a valtage test from mv to a ground or common as you here the next click of a relay on the board after the pilot has had a few seconds.

Mar 12, 2009 | Washing Machines

1 Answer

Colman Furnace keeps kicking on & off

Denise, my heater not a coleman (a monitor heater (oil) kept turning off when the temp got really cold. I would advise you to ask if you can do this, I addded an additive to my drum outside which holds the fuel. Because the deisel thickens up when it gets cold, which makes the heater have a harder time distributing the fuel to the heater. So far the heater has not kicked off.

Jan 09, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Pilot lights fine, furnace fires up, when it turns off the pilot goes out

need to have at least 3 feet of vent out of the roof, if it is to low the coll air will cold soak down to the pilot and shut it down.

Nov 08, 2008 | Cozy (W352E) Heater

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