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When standing pilot is lit with a call for heat gas is released for a couple seconds before it ignights and it backfires hitting the limit swith and pilot goes out. I have cleaned burners and pilot . Ive checked gas presure. what could be causeing that.

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  • Ken Bledsoe May 11, 2010

    Is the unit more then 10 years old? And what brand is it.

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Improper airflow.
Check to see that there are no obstructions in the exhaust flue.
Make sure the inducer fan is operating and the blades are intact. (if your unit is equipped with a draft inducer motor.)

Flame rollout can also be cause by cracked heat exchangers when the blower kicks on, or from wind blowing into the flu in reverse.

(Bad/missing wind deflector outside on top of flue, or unusually gusty wind in unusual angles.)

Posted on Dec 13, 2008

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CGA Mclain .Natural Gas boiler issue 70k btu with a effikal ventx damper, model RVGP. There is no blower for ventilation, no control board with lights. Pilot light will not stay lit. have already replaced...


hey Carli suspect you mean the pilot goes out as soon as u turn your gas control valve back to the on position!? If this is so, you will have to probable reset the flue spill switch located right at the exaust outlet. OR, SOMETIMES THEY HAVE ANOTHER LIMIT switch in the same circuit in series. If the pilot goes out when u release the pilot press down knob, then it is your thermo couple is loose or fininshed,or the pilot flame is not aimed properly at the sensor (thermo couple)

Sep 21, 2011 | Air Conditioners

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I have a evcon 7200erc S-1 The pilot will not stay lit.ignitor cycles while i hold lever to pilot,pilot lites i hold for 60 seconds release lever and pilot goes out.I replaced thermal couple to correct...


Check the following: Pilot orifice or line partially clogged --- remove and clean.
use a fine wire or drill bit to do this.
Gas control valve going bad --- replace gas valve. Gas valves cannot be repaired.

Sep 12, 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

Wont stay lit, cycles like 3 times and wont stay lit until i restart furnace


One possibility is that the Thermo Couple is beginning to fail'
What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
This electrical current is sensed by the control board, or the Main Gas Valve.
As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TV work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
Replacing requires getting down where the TC is, and with a screw driver (usually) the bracket that holds the TC needs to be loosened. Pay attention to wher the wires are routed, and any polarity indicated on the old wires, and duplicate on the new one. Duplicate routing, and polarity, and position the new TC at the edge of the pilot flame.
Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

MackB

Jan 17, 2011 | Air Conditioners

1 Answer

Im calling for heat from the thermastat and control panel, the boiler light and and the fan is running, but no matter how many times i keep re trying the pilot and burner will not commence, is there...


I would check to make sure control on gas valve is in on position and pilot is lit if you have a standing pilot. If you have a spark or hot surface ignitor make sure they are trying to lit pilot. If you have standing pilot model and pilot lit is not on. Turn control on gas valve to off,wait five mins. then turn to pilot. Depress botton and try to light pilot. If it lights hold down for a couple of mins. then release.. If pilot stays lit turn control to on. If thermostat is calling for heat this should bring main burner on. If pilot does not stay lit then replace thermocouple. Hope this helps. Thanks

Nov 16, 2010 | Air Conditioners

1 Answer

Why would the pilot light ignite then turn off?


If it is a true "pilot" light, it needs to be held down long enough to generate the milivolts needed to prove to the gas valve that he is ready to open, other wise the gas valve would open, not igniting, thus causing a "gas leak". Turn the t-stat OFF, turn gas valve to pilot, push down on pilot knob, light pilot and hold for 2 minutes. After 2 mins let go, and if pilot stays lit, turn gas valve to ON, and turn the stat to heat and turn it up to desired temp. If pilot does not stay lit after doing above, try sanding thermo couple( the thing the flame is sitting in) or just spend the $15 bucks and replace therm couple. azeddysac@yahoo.com

Nov 06, 2010 | Ruud UAPA024 Air Conditioner

1 Answer

The heater in my central heating is not getting turn on but the fresh air and cooling is getting turn on


Check the pilot light.Older standing pilot systems use thermocouples to verify the pilot is burning before the gas valve opens.If the pilot wont stay lit replace the thermocouple.
Newer systems light the pilot.On a call for heat the igniter lights the pilot. When the heat is verified the gas valve opens . Some systems use an circuit board with flashing led lights to help troubleshooting.

Jan 11, 2009 | Air Conditioners

1 Answer

ES 160000 Endless Summer Patio heater won't stay lit


Bad thermocouple that senses the heat from the pilot light. This would be evident if you lite the pilot while holding the button down for about 30 seconds. If the pilot goes out as you release the button on the gas valve replace the thermocouple.

Oct 30, 2008 | Air Conditioners

1 Answer

Changed the filter and I'm not getting hot air. how do you light the piolt


If you have a standing pilot then on your gas valve turn it to pilot. Push the button in on the gas valve in the pilot position. Hold for 60 to 120 seconds than release the button a turn to on and the furnace should fire up.

Oct 21, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

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My hot water heater will not stay lit. What could be the problem and would I be able to fix it?


The thermal couple that senses the heat from the pilot and holds the gas valve in the ready condition must be bad. It is not difficult to replace. Note: When you first lite the pilot flame you must hold the button down for at least 30 seconds before releasing it. Also check the size of the pilot flame that contacts the thermocouple.

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