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Ignitor lights gas gas valve shuts off on furnance

Gas furnance issue

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  • Mark Egan May 11, 2010

    It sounds like a gas pressure issue, but you need to be more specific about the model of furnace, type of fuel (natural or propane/lp) and exactly what sequence of symptoms you are having.



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Thanks for your question, I am mr.grzz,
there are to reasons your furnace is doing what its doing, either a stuck pressure switch, or a bad flame sensor, replacing the pressure switch is pretty easy, its a little round flat peice with a tube sticking out of it, if you take the tube off and **** into it, you will hear a little click, try running your furnace while doing this, if it lites off, then bingo, but you have to make sure you have sucktion to the switch !
now the othe thing that I mentioned is the flame sensor, another relitive easy part to replace, its the pencil thin rod that stick up in front of the burners, when the flame ignites, it impinges on the rod which lets you gas valve stay open, if it has a little buile up on it, it might not send the correct signal back to the gas valve, taking it out, and cleaning it with emery cloth normally does the trick, try that, hope my info was helpfull, thanks again for your question, mr.grzz

Posted on Jan 21, 2009


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The unit cycles through all levels and then displays Ignition failure, code B2. I replaced the flame sensor, the ignitor, and there is natural gas at the gas valve.

Sequence of operation for most Gas fired furnaces...
Demand for heat from t-stat
Control board demands combustion chamber purge
(IDM /induced draft motor if it has one)
Control board tests all safeties (this is usually via
the IDM wiring.)
Control board sends 24v to PV at the gas valve igniting
the pilot OR control board sends voltage to the
ignitor as in yours.
Control board sends 24v to MV at the gas valve.
Control board allows time for heat exchanger to warm
then calls for blower operation.

Your sequence of operation? Won't be the flame sensor unless ignion has been achieved. If the ignitor is working/glowing red? Is the IDM working? Make & model#?

May 26, 2015 | Heating & Cooling

1 Answer

My furnance keeps turning off and I could go to furnance flip switch on and it only last 5 minutes then shuts off again

You may want to check the limit switch or you could have a issue with the gas valve or transformer. I would check the low voltage transformer first, Sometimes I have found that under load the transformer will open ( quit working) and will close after power is removed and it cools down, It indicates a bad internal connection.

Jan 26, 2013 | American Standard Trane Ge Gas Furnace...

2 Answers

I have a Goodman gas furnance. The furmance kicks on the glow rod lights and then the furnance shuts down after about 60 seconds it goes through the same cycle. The burners never come on. What's wrong?

Let's trouble shoot a few possibilities:

Can you confirm that your gas pressure/ supply is correct-- by lighting all of the range top burners at the same time-- Do they all light quickly, and burn to full height, without much of any yellowing at the flame tips? That should indicate you have god gas pressure and supply.

Now-- in the Oven itself-
When you light the BROIL burner-- does it's glow ignitor light up, and does that burner light off OK?

If it is only the main oven burner that is not lighting, are you able to remove the cover plate that covers it, and watch it light off? -- Any clues on whether or not the gas valve even open?

If NO gas flow, likely you need a new Main Oven Gas Valve-- Probably need to call your Gas Appliance service person.

Let us know if this helped

Mack B

Jan 23, 2011 | Goodman GMS90703BXA Heater

1 Answer

I have a Goodman gas furnance. The furmance kicks on the glow rod lights and then the furnance shuts down after about 60 seconds it goes through the same cycle. The burners never come on. What's wrong?

Gas valve is not kicking in or gas shut offs are off. Can you check voltage where 2 wires connect to gas valve. Can you see blinking lights thru lower door window and count blinks. Code sticker should be on inside of lower door.

Jan 23, 2011 | Heating & Cooling

1 Answer

Heat element lights up and furnance makes a clicking sound but will not light flame. have replaced gas valve,memory board and heat sensor

This could be a tough one-- for you obviously are experienced with service work-- for you have changed the main valve, and the main memory board!-- now what?

Do you have a trouble shooting guide for the board?
There must be some voltages that can be read, telling you what is locking out the valve from letting gas pass-- (What do the board trouble-shooting instructions say?)

I am sure you know, that the ignitor draws current, and the control board has to sense that current, to let the gas valve open. (If ignitor is broken-- OR NOT THE RIGHT CURRENT!-- the gas valve can not get instructions to open.. Is the ignitor the correct one?)

Then when the gas valve initially opens-- it has to sense flame, thru the Flame sensing rod within a second or two- or it will shut off, too.

Have you purged the gas line, so that good, volatile gas is passing thru the valve those few seconds?

There are no indicator lights, or voltages to give you any clues?

I'm trying to help you think of some way to get the board to help you analyze the clues.

Sorry I can't help more.

Mack B

Jan 16, 2011 | Heating & Cooling

1 Answer

Dryer spins, ignitor lights gas, then after 30 seconds gas valve shuts and fire goes out.

This may be a normal issue. Or you could have a vent restriction cutting off your hi limit thermostat early. Let the dryer run for 30 mins and look through the peep hole if your ignitor fires up and your gas valve doesnt open then your valve coils could be failing. Check to see if you have good airflow outside. If you do then replace the gas coils part number is 5303931775 they are located on top of the gas valve and have white connectors going to them one is a three prong and one will be a 2 prong. you dont have to shut the gas off to replace them.

Let me know if this helps

Jan 22, 2010 | Maytag Dryers

1 Answer

Ignitor glows but no heat and we know the gas is on. It would light a day ago but would not stay on. Now it will not even come on but the ignitor glows. The AC works. We wonder if it is the circuit board ,...

Make sure the gas valve switch is turned on, if you
have another gas source other than natural gas make
sure your tank is full and turned on.

If you are mechanically inclined, you could try to
take the cap loose on the drip leg of the gas pipe and make sure you have gas to the furnace.

If the igniter glows but shuts off, usually mean there
is a problem with gas valve or vent system

Jan 09, 2010 | Goodman GMS90703BXA Heater

1 Answer

Heater keeps turning on & off but no heat

What type of heater are we talking about? if its the home furnance, it sounds like the ignitor is coming on and shutting back down, the heat comes on ignite and the blower comes on like normal, then after a few minutes it will shut down, you will have to remove the ignitor, clean it with a little piece of sand paper to remove the carbon build-up, replace the ignitor and turn the furnance back on, this should correct the problem.

Dec 14, 2009 | Heating & Cooling

1 Answer

Rheem gas valve for furnance

It is intentional. It's a slow close valve. There is no adjustment. You can usually replace it with an instant open/close valve.

Jan 18, 2009 | Heating & Cooling

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