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You will need a monometer to check gas pressure before and after the valve and a voltmeter to check for voltage at the valve.
Hook up the monometer and watch for pressure drop during the ignition phase. If it does and the heater won't light your problem is in the ignitor or control board. If it does not your problem is the board or the valve.
Check for voltage at the gas valve to confirm if the valve or the board is the problem.
If you are unfamiliar with these tools you should call a professional. You are working in a potentially dangerous environment.
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