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.
The unit uses "flame rectification" (basically it is sensing a pulsing dc current) to sense the flame and is very sensitive to bad/poor ground and also to a dirty flame sensor. The gas ignition does not shut off the valve ...the board is not sensing the current thru the flame so its reading a "no Fire" fault and shutting down.
Clean the flame sensor with sandpaper till its brite and shiny and check all connections to make sure they are tight and very clean, especially the ground to the board and also to the furnace itself (sometimes we have to actually drive a ground rod near the furnace itself or use some other means to make sure that a proper gorund is achieved).
If still have a problem; I would try another board, the flame sensor is just a piece of solid stainless alloy wire so its really not necessary to change it unless the ceramic insulator is cracked.
Before you buy another board, I would suggest that you have a pro look at it.
Posted on Nov 16, 2008
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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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