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what is the error code flashing......do you have voltage from control board to valve when going for ignition after ignitor glows ..should hear a click for gas valve to open.
 

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All the repairs have been done by pros. They say the gas pressure is right and voltage is correct.
then they are pro parts changers.....need to trouble shoot the problem in able to repair it....not stick parts on in hopes to repair it.. sorry for being straight forward..
 

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Did these pros leave a copy of the work order? Does it say anything about manifold pressure or working pressure? Actual numbers is what I'm looking for.

Did you want to try to troubleshoot this yourself? If you have a multimeter, you can check voltage across the gas valve. (if there are 3 wires to it, test between the 2 and the common, usually in the middle. It'll be marked) If you get 24v when the igniter is glowing the brightest, then the valve should be open. You should smell a tinge of unburnt gas at the vent outlet. Give us that feedback and we can proceed further.

Exact model number will help. Pictures will help even more.

Cheers!
 

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Use your multimeter to check for voltage at the gas valve... when the ignitor begins to glow put your test leads on the gas valve and check the 2 wires going to the valve... you should get 24v once the ignitor is hot enough... if you do not see 24v at the gas vavle... follow the 2 wires back and check there... you may have a bad control board
 

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So what's the voltage to the valve during trial? What's inlet and outlet gas pressure? Trouble codes?
And when you ask the tech, "good" or "ok" is not an acceptable term of measurement. Exact numbers are needed to diagnose.
Someone's making this a lot harder then it needs to be.
 
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