Question about Goodman GMS90703BXA Heater

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Explosive Ignition When my LP gas heater lights, I hear the ignitor click and that is followed by an explosion rather than a smooth ignition in the burner area. This explosion varies in relation to how long it is between ignition cycles. The longer the time the greater the bang. I do not smell any gas when the heater is not operating so I do not think this is a leak that allows accumulation in the chamber but rather a failure to ignite when the main gas is first released. Ideas?

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Re: Explosive Ignition

Check the alignment of the igniter to burner. It should be in the flame of the burner but to one side or just below. Does the igniter glow about 15 seconds prior to the gas valve opening or just a second or two. The igniter should glow 10-15 seconds prior. If the temperatures outside are unseasonably cold, you could be experiencing a gas regulator condition. If so, as the temperature rises, the condition would lessen. Call your gas company to get the regulator tested and gas pressure checked.

Posted on Jan 04, 2008

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It sounds like the ignitor is not working, Since the heater is not detecting a flame it goes to lockout. Check the ignitor wiring to see if it is in good shape. Sometimes the connection where the wire (from the IID) connects to the ignitor gets corroded.

It could also be the IID which makes sure the safety loop is complete before calling for heat and sending current to the ignitor. Good luck with it.

Jan 11, 2014 | Mr. Heater Natural Gas Garage Heater -...

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No ignition

Check this page its a discussion on your same problem. I think it can help.


Feb 19, 2008 | Heaters

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Ignition problems on model cf504c-h

Short pilot causing explosive ignition or burners out of line when lighting up

Feb 19, 2013 | Heaters

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My goodman furnace 80703 fan comes on ignitor glows burner starts , cuts off in 10 secs,furnace starts cycle again. home no heat

I am not a furnace tech but, there are several inputs to a gas valve. There must be an 1) electrical/mechanical indication that there is a draft fan running (to move potentially explosive gas so it doesn't accumulate), 2) adequate gas pressure to the valve, 3) the thermostat must be calling for heat 4) and electrical indication that there is an ignition source. In your scenario, you have the source of ignition, the gas valve is picking up the burner but the gas valve believes there is something missing so it shuts off the gas to the burner. In this case, I suppose you might not have enough gas pressure (is another gas appliance running or is the line to the furnace too small?), a thermocouple probably isn't the problem since the burner wouldn't pick up if the gas valve didn't believe the ignition source wasn't good enough. You could have a plugged chimney or exhaust pipe if it is direct vented since there is also a pressure switch that detects whether there is enough draft once the burner picks up. Really should call a furnace person especially if you don't have a carbon monoxide detector that you trust. If you think you are capable of continuing, you could jumper the various inputs the the gas valve one by one until the burner picks up and stays picked up. Whichever terminals you jumper that accomplish this, is the culprit. Look at the schematic on the side cover to the furnace for this information. Hope this helps...

Oct 01, 2011 | Goodman GMS90703BXA Heater

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The Goodman Heater was installed in 2004. Thermostat set at 75F, the fan that blows CO2 out was on for about 1 minute, then I could hear the sound of the gas blowing into the furnace, but the ignitor...

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 30, 2010 | Goodman GMS80903BNA Heater

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Gas valve clicks but does not light

The click is either the gas valve opening or the ignitor trying to ignite.

From what you decribe,im going to say you have a bad ignitor.

If the gas valve is indeed opening,then you need igniton to light the gas,
which leads me to say bad ignitor.

Hope this helps.

Feb 02, 2010 | Coleman Propane Forced Air Heater...

1 Answer

Coleman space heather,when burners goes on it blow's out

it sound like the pilot is too small which would make the pouf sound pilot could be blocked , it should light with a wow wohumph
sounds silly but it the best way to say it or the burner lights smooth

Feb 07, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Running out of LP??

Yes. The ignitor is trying to find fire and it can't. That's an ignition error. It should go away once you get fire to the sensors. You might have to hit a reset button, it all depends on the heater.

Feb 05, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Goodman GMP075-3 ignition problem

OK, if the furnace is not lighting for even a few seconds, you have either a bad gas valve, bad wire, bad control module or no gas. The pressure switch is not the issue. Check all wires to the gas valve and look for 24 volts across them when the ignitor glows and you hear the click. Then test for 24 volts to ground. It could be a bad ground wire.

Sep 28, 2008 | Goodman GMS90703BXA Heater

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