Question about Goodman GMS90703BXA Heater
My heater runs successfully through the sequence of operations but when the gas ignites it immediately shuts the valve. My flame sensor has been replaced and I recently replaced the control board. My Lennox furnace goes through the sequence and gas valve does not stay on replace flame sensor,board ,gas valve and air switch and still does the same thing,What is it?4 ac peole have looked at it and can't figure it out.
I have just finished a job that sounds similar. I had to finally contact technical support, the flame rod was fine, 4.4 uA with meter in series to the board so I thought the board was bad. But the problem was the combustion blower housing the had trash in it and causing the air switch to drop momentarily. Whatever was coating the housing was coming of and was being blown around causing the air switch to drop out. With a digital meter it was hard to detect, so I had to put a jumper across the switch once the combustion blower reached speed. Then the burner stayed on, so I pulled the blower housing and cleaned it out and it worked fine. Lennox has a replacement kit to replace the blower and air switch. Talk about pull your hair out. I would have believed it if I would have seen it for myself. Never heard of anything like this before.
Posted on Jan 09, 2009
Get a volt meter and check and see if you loose 24 volt power to the gas valve then make sure your grounds are goodif thoose are ok check for a 24 volt drop on transformer
Posted on Nov 16, 2008
Thanks for the input. However I have fixed my problem. I went to arnoldservice.com The site owner had a page on flame sensors that described my problem. He suggested cleaning the flame sensor with steel wool. When I did that my problem went away. Sense Arnold sells parts and could have sold me a sensor, it was surprising that he suggested the cleaning before buying. I later discovered he was a devote Christian which explained everything. If I ever need a part I'll go there.
Posted on Jan 09, 2009
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Posted on Jan 02, 2017
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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.
Dec 11, 2010 | Mr. Heater Natural Gas Garage Heater -...
When there is a Call for heat, the control delays ignition until combustion air
Blower operation has been proved and pre-purge period
Has elapsed. It then opens the gas valve and generates a
Spark to ignite the burners. Trial for ignition lasts for 7 seconds.
At the same time, the control begins monitoring the
Flame sensor. If the flame current is too weak (less than 1
Micro amp) or if the burners do not ignite (within the 7 second
Ignition trial), the control will shut off spark and the combustion
Air blower and de-energize the gas valve. Flame
Current should be between 1 and 5 micro amps to keep the
Gas valve open.
The control will attempt to ignite the burners up to two more
Times. Each time the control restarts the ignition sequence,
It begins with a 45 second pre-purge. If flame is not sensed
After the third trial, the control locks out. Lockout means that
The control shuts off the gas valve, spark and combustion air
Blower for 60 minutes. At the end of 60 minutes the control
Completely resets and will attempt ignition up to three times.
The control can be manually reset before the end of 60 minutes
By momentarily turning off power to the unit.
here is a link to an operations manual
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