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Old 04-12-2012, 08:27 AM   #16
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New Furnace won't fire up


Just unscrew your flex connector where it enters the furnace and turn the valve on and enjoy the aroma. Then you'll know you have gas.

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Old 04-12-2012, 10:54 AM   #17
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New Furnace won't fire up


Quote...
My water manometer shows about 9” WC when screwed into the inlet side of the gas valve.

I don't get the flex connecter conversation here. Just what do you think the manometer is measuring downstream of the flex connecter?

Last edited by how; 04-12-2012 at 10:58 AM.
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Old 07-26-2012, 11:31 AM   #18
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New Furnace won't fire up


Gas valve regulator requires adjusting to allow flow through the gas valve OR gas valve may be air locked..disassemble to vent diaphragm and reassemble..had this happen to me on a boiler start up for a school..boiler equipped with 2 inch gas regulator but it would not allow gas flow..took it all apart to look for blockage or defects but did not find any..reassembled and all worked fine..OR you have a defective gas valve that is bound or seized and will not open even though you hear the solenoid click.. Let us know how you make out. Good luck!
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Old 07-27-2012, 08:01 PM   #19
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New Furnace won't fire up


One of your springs is plrobably messed. Ensure you have the valve wired correctly. Do you have a part number or picture for the valve? There is also a pilot flame adjustment screw, make sure that is adjusted so you get enough gas.

How much manifold pressure does the unit require. 9" sounds a bit low IMHO for lp pressure. Take a lighter to the pilot as well, sometimes the spark igniter still sparks but isn't hot enough or in the right place.
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Old 07-28-2012, 06:38 AM   #20
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New Furnace won't fire up


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There is also a pilot flame adjustment screw, make sure that is adjusted so you get enough gas.
On a 95% furnace with an ignitor? I don't think so ...

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