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I have a central heater. it will come on and worh fine, by this i mean the draft induce motor comes on, then the glow igniter will come on then flame will come on but after 10 minits or so it will stip the flame and the big blower stays running but the draft induce motor is not runing and will not come on till i turn the thermistat off then back to heat also i remove the metal cover and then it will light. please help me.

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  • Stephen Evans May 11, 2010

    make sure your vent pipe is clear all the way out. Is sounds like a venting problem shutting down the pressure switch.

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Sounds like the filter inside of the unit may be dirty and or the vent cap could be partially blocked causing the flue gas to build upo until the unit tripos on the high limit saftey

Posted on Mar 21, 2009

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1 Answer

Pilot lights but main burner doesn't come on. Just replaced the pilot safety switch but still didn't start.


does the induced draft motor come on and does the pressure switch close? have you checked the roll out safeties?

Dec 02, 2014 | Ruud Central System Air Conditioner

1 Answer

How to trouble shoot trane 80 gas furnce


The 1st thing I do is go to the thermostat and put the Fan switch from Auto to the On position. If the fan operates this proves you have both high and low voltages and the breaker, fuses, transformer etc is functional, this saves one from going to the breakers and air handler often in an attic or roof or basement.
If the fan does not operate then I check for correct power.
Set the thermostat for heat mode and turn the temperature setting well above the rooms temperature. and observe the furnaces sequence of operation.
What you normally expect is upon the white circuit from the thermostat being energized with 24 volts, the induced draft motor will cycle for 30-60 seconds typically to pre purge the heat exchanger, after this purge the induced draft motor has a pressure switch that senses the induced draft operation thus proving the induced draft motors running and alloqw the ignition to begin, either a spark or a HSI, hot surface ignition type.
If you see no bright white light or hear a sparking noise by the burner area this is normal, this will be followed by a trial period for ignition, meaning the gas valve will be energized for a 30 second trial period, during this time the flame rectification proves a flame exists by a DC signal being sent back to the module by the flame sensor or the ground/burner ground.
This DC signal is very weak and easily interrupted and this is why we clean flame sensors and simply re seating wiring will often times correct a situation,
The typical issues are the induced drat pressure switch and the orifice that it's tubing connects to on the induced draft housing.
This port must be reamed to clear carbon and if not will cause a problem such as locking out requiring resetting power or a 5 hour wait for some units,
You need to insure the limits and roll outs are all closed, its all failrly simple if the LED is tellingyou the error as they do today.

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Feb 19, 2013 | Air Conditioners

1 Answer

The fan blows but the igniter does not light.


When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. On a call for heat
2.The draft inducer motor starts.

3.The pressure switch which has a small plastic or rubber tube attached yo it senses the negative pressure produced by the draft inducer and closes.

4.The draft inducer runs for 30 seconds to a minute before you hear the gas making a hissing sound. The ignitor did not glow,therefore the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the gas hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Please Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could possibly have a furnace control board problem or a bad limit switch or rollout switch problem.

Mar 10, 2011 | Air Conditioners

1 Answer

Hello there, I have a Goodman GMH951155DXAC furnace that I got in 2007. I have the following problem for the last 4 years: When the thermostat calls for heat the induced draft motor comes on and 30-40...


With furnace OFF ,Disconnect the top of the hose that leads to the
Bottom of Daft inducer Box, Now blow into it water will come out
of the drain hoses "condensation " this will shut the unit down if not drained. There must be a Trap on the side of the Furnace with water in it , to have positive presure to suck out condensation. This will fix problem. some installers forget to install this Trap that comes with Unit.....!!!! A little item
that will shut the whole system DOWN. :o)

Jan 06, 2011 | Goodman Air Conditioners

1 Answer

I have a newer tappan heater and get 4 blinks on led for error code the unit starts up fine and has flame but flame goes off when blower kicks on


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 26, 2010 | Air Conditioners

1 Answer

Induction fan motor cycles on and off , with no call for heat


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 26, 2010 | Air Conditioners

1 Answer

My goodman furnace keeps lighting for about 10 seconds than goes out lots of clicking sounds


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad igniter what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat.
2. Draft inducer motor starts.
3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.
4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.
Solution: You probably need to purchase and install a new igniter. I would suggest that you inspect your igniter closely for cracks. Make sure you do not touch the igniter with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, roll-out switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

NATE, NCCER, PHCC,HVAC Certified Instructor

Oct 25, 2010 | Air Conditioners

1 Answer

GOODMAN Air & Heating unit installed. After one and half year the heater would not egnite. Exhast fan starts but no ignition? Can anyone help?


either the pressure switch is not closing (probably clogged) or the ignitor is bad.


Verify that 24 v is coming out of the pressure switch, after the draft inducer motor comes on, then look for the ignitor to glow.
Do you see the glow from the ignitor? If not, replace it.

Jan 30, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Blowing cold air when heater is on


if the air comming out is cold then you might need to check for sequence of opperation starting with draft inducer motor on then spark,or glow flame proven then blower if any is missing then that will 60% be where the problem is

Jan 08, 2010 | Air Conditioners

2 Answers

Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on


most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

Oct 25, 2008 | Air Conditioners

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