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Heater not staying lit - Goodman Air Conditioners

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  • rdallen Dec 01, 2008

    Goodman Model # GMH950703BXAA Ser. # 0612626994 Gas type = LP Two years old.



    Unit operated flawlessly for two seasons. This season it started acting up as follows:

    Thermostat calls for heat----Exhaust fan starts running-----Ignitor comes on----Burners light-----Blower fan comes on-----After about one minute the flames go out-----both fans continue to run------Ignitor activates------Burners light and burn for another minute to ninety seconds, then go out again. This cycle continues until thermostat reaches set temp. Status (red) LED stays solid on indicating normal operation. I replaced the thermostat and the unit ran normal for several days before starting the intermittant lighting again. I have a multimeter and can replace parts in this type appliance.

  • rdallen Dec 01, 2008

    12/01 Flame sensor was removed and cleaned with fine emory cloth. No change. Where do i check the flame sense signal?

  • rdallen Dec 04, 2008

    This info was helpful in finding where to start. The furnace now extinguishes and re-ignites several times while bringing the room temp. up to thermostat request. I'll install a replacement flame sensor this weekend and proceed from there. Something is telling the gas valve to close and i need to find out what it is.

  • Joseph Lillie
    Joseph Lillie May 11, 2010

    Hello and welcome to FixYa.
    Can I have the full model number, serial number, type of gas?
    What exactly is the unit doing?
    Do you have skills to work on this type of appliance?
    Do you have a electrical meter?


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This from the installation manual on your furnace.
I think you need check the flame senor for proper output. if the output is correct you wil have to switch the electronic board.

FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the flame sensor. This coating acts as an
insulator causing a drop in the flame sense signal. If the flame
sense signal drops too low the furnace will not sense flame and
will lock out. The flame sensor should be carefully cleaned by a
qualified servicer using emery cloth or steel wool. Following cleaning,
the flame sense signal should be 1 to 6 microamps at 115
volts.
Post me back and let me know.

Posted on Dec 01, 2008

  • Joseph Lillie
    Joseph Lillie Dec 01, 2008

    You disconnect wire and test through your meter. Your meter will need to read microamps.

  • Joseph Lillie
    Joseph Lillie Dec 04, 2008

    most likely the the board that sensor goes to

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My fathers Bosch water wizard tf 250 will not start. the water will flow but no gas will not ignite or come through the pipe to the heater. the gas bottle is full. thanks Dave Tooley


Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.

If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

Jun 22, 2011 | Air Conditioners

1 Answer

Once I press the button to start the heater must wait a good 30 seconds or more before it stays lit when button is released.


That's normal. It's the correct way to allow the the Thermocouple and/or Thermopile to fully heat up.
If you have been turning the pilot light OFF after each use and then relighting it when you want to use the heater, that's really not necessary. Leaving the pilot lit during the heating season is a better way to go. If you think you're saying gas by turning the pilot light OFF and then relighting it again, when you want heat, you're really not saving a significant amount of gas or money. The pilot burning continuously, uses very little gas.

Hope this helped you. Please let me know. Thanks

May 16, 2011 | Air Conditioners

1 Answer

Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.


Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,
Kelly

Feb 20, 2011 | Air Conditioners

1 Answer

My 30,000 btu Blue Flame gas wall heater wont stay lit, pilot light stays lit but the blue flame went out and had smell of gas I shut off the gas supply but, dont know what is the problem thanks, marty


you could have a overdraft problem causing your flame to go out. check your draft setting at the burner and make sure it's not open too wide. If it is, simply close it it slowly and make sure that the flame remains totally blue.

Nov 27, 2010 | Air Conditioners

1 Answer

The pilot light will stay lit. Go to turn on heater and stays on briefly and goes out The heater wont stay lit.


If the fan comes on and blows out the pilot light then you need a new furnace because that's the sign of a crack in the heat exchanger. Need a little better description. Do the burners light then the fan come`s on and then it goes out completely?

Nov 24, 2010 | Air Conditioners

1 Answer

GAS WATER HEATER PILOT LIGHT WONT STAY LIT


It could only be the following problems: Therm couple failed, gas valve failed. Therm couple is the cheaper fix it, so it would be your best first try.

Dec 05, 2008 | Air Conditioners

1 Answer

Water heater burner flame is low does not heat water it was working this morning pilot stays lit


frist did this heater go under water if so call the pros.this can be do to dirty orfic on burner. clog presure regulater at gas meater check other gas applince.

Sep 17, 2008 | Intertherm Air Conditioners

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