Question about Goodman GMS90703BXA Heater

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My unit cycles on glow coil comes on and still no gas comes check to see if i had 24volts to gas valve when call for and it does but still wont open

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Check to see if you have gas pressure coming to the gas valve. If you have that and the gas valve is getting 24V then it should work. If not then the gas valve needs to be replaced. This is not uncommon for them to fail.

Posted on Nov 12, 2009


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Hi, I have seen this so many times. It could be a couple of things.In the sequence of operation, normally the small inducer fan will start to come on first, if your model has one. With the motor on, it closes a set of contacts telling the module, hey I am on and running. A safety device.Module sends power to the glow plug to light. If it glows but doesn't light, it may try a couple of times before it locks out the module, and you're indoor fan will come on and run.1 of 2 components will be at fault. Either the main gas valve coil is dead and not opening to fire the burners when the glow plug is established, or the ignition module is faulty not sending 24volts to the main gas valve to open. Try this, go to the unit and have someone set it to come on. When you see the glow plug start to get hot, listen very closely to the main gas valve to make a click.You can even put your finger on the small coil and feel it energize. If it does click, and you can fill it do so, this means it is getting the 24 volts to open and fire, but the coil is faulty and you must replace the valve. If you have a volt meter, you can put you're 2 leads on the 2 terminals, hot and common to see if you have 24 volts to it when the glow plug glows and its time for the valve to open.A click, feel, or 24volts,a/c tells that the module is good but valve is faulty.If no sound, click, or no feeling anything and you do have a volt meter and you have no 24 volts there at valve when its time to fire, the module is at fault and must be replaced. You can check for 24volts ac there also at the terminals marked mgv, and c or Grd.You should have 24volts there when glow plug is glowing before it goes out.I wanted to fully explain to you the steps you must take to find the solution, I know it might sound confusing, but it is rather simple when you know the sequence of operation of something. You can purchase the valve or module at an appliance parts house. Mark all wiring and draw a picture of the part you are replaceing.The gas valve is very easy to remove and install.It could be 1/2x 1/2 pipe or 1/2x 3/4, 3/4x3/4 ect.Turn off gas. remove flex line. Remove gas hand valve. Remove pipe nipple. Grab hold of main gas valve and turn CCW while holding nipple at other end. Remove wiring first and mark.Install in reverse using pipe dope. You can do this by hearing the click without a meter. It would be helpful if you could pick up a cheap model at like Sears tools.I do this just about everyday and I can promise you it is one of the two components.Please keep me informed and make a copy of this solution if you like for reference. It should not take you to long to know which is faulty. Best of Luck, and Sincerely,

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