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Green light flashes on the furnace. Checked pressure switch and it is not the issue. It is vented to outside 28 ft by PVC. Bypassed pressure switch and it still will not fire. New furnace. any su

Green light flashes on the furnace. Checked pressure switch and it is not the issue. It is vented to outside 28 ft by PVC. Bypassed pressure switch and it still will not fire. New furnace. any suggestions?

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You are dangerous, the pressure switch has to be open to start and close on call for heat. the flue needs to climb .25" per foot to let water back into drain and vent properly, 30 ft is far so it may need to be enlarged if the btu is already maxed for the size of the pvc. read install manual .

Posted on Nov 20, 2014

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SOURCE: intertherm furnace explosive burner ignition

You absolutely must stay with Therin's recommendation. You do have a block or a cracked heat exchanger and this is nothing to toy with. Carbon Monoxide is very serious and dangerouos. All of your new furnaces should be power ventilated and you need to retire that one.

Posted on Nov 20, 2007

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SOURCE: furnace won't kick on

My gas furnace wont kick on when it has been off for awile, we have replaced the thermostate and checked eveything else. Once we gett it going it works but wont kick in once the temp drops

Posted on Nov 30, 2008

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SOURCE: Goodman GMS90904CXA Wont ignite, light blinks 3 times

I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.

Posted on Dec 11, 2008

meBNme
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SOURCE: weak flame in intertherm furnace

Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Posted on Jan 19, 2009

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SOURCE: furnace has does not ignite flame

how often do you replace your filter?

On the limit switch that protects your unit when it gets to hot the number one reason is dirty filter.

The pressure switch is located in the upper side of cabinet has a rubber hose connected to it. They very rarely go out though. So find your vent fan the first fan that comes on and follow the rubber hose to the switch.

Posted on Feb 11, 2009

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