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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 | Air Conditioners

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...

1 Answer

My Amana GUI090B30B furnace will not ignite. The ignitor glows then the valve releases gas but the gas does not ignite. The ignitor goes out and the valve shuts after a second or two of trying to ignite...

Hello, it is possible that even tnough the ignitor is glowing it might be too weak to ignite the burners. I would cneck the resistance of the ignitor with a multmeter, should be between 40-90 ohms typically

Nov 28, 2011 | Air Conditioners

1 Answer

My furnance will not light. The blower motor comes on; the ignitor will not light and there is no gas smell.

The ignitor is hot surface I'm assuming. If it is, it will have a molex plug on the 2 lead wires. Unplug & Ohm it out with an Ohm meter. It should be anywhere between 50 & 100 ohms. If the resistance is any higher, replace it.

Feb 01, 2011 | Bryant Air Conditioners

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 | Air Conditioners

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 | Air Conditioners

2 Answers

I have a goodman furnace, the ignitor glows gas lights and then burns only a short time and then goes out, this hapens 3 times then furnace cycles out and I get a blinking light,

Do you have Natural Gas, or LP Gas (Propane)
Do you have any other gas appliances?- like an oven?
Do you have gas at the other appliances?

The Ignitor getting bright, and cycling 3 times is a normal number of 'LIGHT' attempts -- and shows that you do have a good ignitor- That is important! and that is GOOD!

However-- it sounds like you have NO GAS.-- Is that possible?
If you do have gas in the kitchen, then either the manual Shut off valve is shut to this appliance, or the main gas valve is not opening --- for any of a number of reasons-

Tell us more about what you do have in other appliances.

Mack B

Dec 28, 2010 | Goodman Air Conditioners

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 | Air Conditioners

1 Answer

Furnance will not heat

Check your voltage going into the gas valve. It should be 24-27 volts. If it is to low the gas valve will chatter. If the voltage is strong enough you have a bad gas valve.

Dec 09, 2008 | Air Conditioners

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