Question about Goodman GMS90703BXA Heater

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Change gas valve but the heater light the next time it would`t

Checked gas pressure it is at 2'wc and at h fire and low it is 1&3

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  • tferner May 11, 2010

    Is the 2" w.c. at the manifold or inlet?

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  • Goodman Master
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If its nat gas it should be at 3' wc lpg 11''

Posted on Jan 08, 2009

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Will not fire led light flashing 2 times


You didn't provide very much information, but I will try to help you. Here are some possibilities.

1. The pressure switch may not be closing, or is stuck closed all the time.

2. If this furnace has a hot surface ignitor, it may be faulty or not getting voltage.

3. If this furnace has spark ignition, the module could be faulty or the ignitor may not be positioned correctly.

4. The gas valve may be faulty, turned off, or may not have gas pressure to the valve.

There may be other issues, but I tried to cover the most likely causes. I hope this helps!

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Desa heater


For (fire) safety, there is usually a thermostat that will turn off the gas if pilot light goes out.

So when you try to light the pilot you will have keep press & hold the pilot gas supply for at least 10 sec until the thermostat is heated up. Then only when the pilot light stays on continually, can you turn on the burner.

Forget about changing to a High pressure regulator!

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1 Answer

Rheem Classic heater:Fan comes on and blows cold air when set to heat. The electric starter plug seems to glow inside the unit several times as it is running but it appears to fail in igniting any gas. ...


your fan is comming on because it is on a timer after the thermostat calls for heat. if your glow bar is getting orange 3 times is normal before lock out. check for gas to furnace. there should be a union or flex line at the unit. crack the connector or union.you can apply a soapy water or just rely on you hearing. did it "hiss"? or blow bubbles? now you know there is gas to the unit.after that you will need a volt meter or test light. find a wiring plan on the inside of the fan door, hopefully,. check for voltage 24 volt at the coil on the gas valve, wire in to ground, toward the end of the glow each time. no voltage bad board. voltage there check orifices on burner manafold. spyders like the small hole.if not plugged valve maybe bad. low gas pressure is always suspect. 5"-14" wc into the valve 3.5" wc out,for natural gas

Feb 03, 2011 | Heating & Cooling

1 Answer

A REZNOR UDAP-100 NOT HOT ENOUGH IN HEAT EXCHANGER NEED TO GET MORE GAS PREASURE


Hi,
Check the gas pressure in and make sure the line is not too small or the gas is restricted somewhere...
For that you will need a gas pressure gauge that will measure WC (water column) Inches pressure..
The pressure will need to be at least 7 in. WC for Nat. gas and 12 for LP gas
Then take out the test plug on the manifold side of the gas valve and check the manifold pressure.. the gas pressure the manufacturer wants will be listed on the rating plate...
That is usually 4 in. WC for Nat. gas and 10 in. WC for LP gas
The gas pressure can be adjusted by removing the slotted head cap from the top of the gas valve and then turning hte adjustment screw underneath down for more pressure to the manifold..

Just be aware that you NEED to check the pressure with a meter!!! Too much gas will cause injury or death from fire explosion of CO piosoning!!!

heatman101

Jan 21, 2011 | Heating & Cooling

1 Answer

I had purchased this unit RMO-80LPT heater several years back, I never installed unitl this week. the sales en at the time told me it was gas/propane. Now seeing the -80LPT on the side is it propane...


The orifices for a propane heater are much smaller so you will not be able to get the natural gas to flow properly with the current orifices.

The both the natural gas and propane valve are 1/2 psi so the valve can be used but the regulator for propane is typically 8-11 inches on the wc table and the natural gas is typically 3 lbs on the wc.

You may be able to drill out the orifices in the burner and in the pilot ods and get the unit to work.

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1 Answer

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Hello,Sounds like it is overheating due to restricted flow.If it is shuting down due to pressure.Maybe high limit?If it is oil fired try reducing the nozzle size/input.If gas you could reduce input pressure 1"WC.

Apr 20, 2010 | Heating & Cooling

1 Answer

Yokr gas furnace will not start up


You could have the gas co to check to preassures at or before the unit. Too low or high a preassure and the gas valve cant regulate the proper flow>>Natural gas to the house needs at least 5"-wc psi ---to the gas valve needs 7.5"--wc and while its calling for heat the orrifice needs 3.5" -wc psi! Propane needs 11" wc psi to the valve on the unit and 11' -wc psi to the inside furnace.

Dec 21, 2009 | Heating & Cooling

1 Answer

My propane furnace sounds like a blowtorch when it kicks on but it also happens to my cooking stove


Hi, working with natural gas and converting them over to propane for the country folk, I do indeed know the sound. You might want to take a look at the burner section for any signs of carbon,soot, build up any where.If the gas pressure has changed for some reason, you will get this blow torch sound.You would need the correct meter to check or measure the inches of W.C. Inlet pressure not to exceed 1/2p.s.I. Outlet for propane has changed over the last 10 years, you will now find on the MGV (main gas valve) for propane is almost the same as with natural gas.W.C. is a measurement used in reading gas pressures, stands for inches of water-column. Recommended pressures are well marked in manuals and on valve its self. Right at 2.5 to 4" w.c. So, check for carbon build up and clean if needed.If it burns radical, pressures should be checked with a gas pressure test kit.Yellow Jacket makes a good one. I hope this has been of some help to you, Sincerely,
Shastalaker7

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1 Answer

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1 Answer

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Either a restriction in the gas train, low gas pressure or a bad gas valve. Check the pressure on the gas line when on pilot and again when the burners are running. Depending upon what type of gas it runs on, you should have at least 4" W.C. if Natural Gas and 10" W.C. if Propane. If gas pressures test good and all valves are open, you are looking at replacing the gas valve.

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