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Old 11-22-2010, 12:23 AM   #1
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rooftop gas unit not heating

I tried to help a friend with his rofftop heating. This is spark ignition system: ribbon pilot ignites, flame sensor senses pilot, ignition module sends 24vac to main terminal on Honeywell GV but no main gas out! So I replace Gas valve but still- no good.Any toughts? There is 9" w.c. suply to GV


Last edited by keymanoman; 11-22-2010 at 01:15 AM.
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