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Old 10-18-2011, 11:24 AM   #16
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Gas Furnace Ruud Super Quiet 80 ignition problems


Elsinore, the draft inducer is always the first thing to come on in heatng mode. That hose that attaches from there to the pressure switch, if bad, is not allowing the switch to close. It could be that or that switch is gunked up and is not closing. Without that switch closing nothing else will work. The switch allows for continuity, an elecrical signal to pass through, to go back to the control board, telling it that the exhaust side of the furnace is working properly so go ahead and light the burners for flames.

A furnace will not light up until it proves to itself that it can exhaust those burned gases.

Check that hose and switch if the inducer is coming on.

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Old 10-18-2011, 11:42 AM   #17
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Gas Furnace Ruud Super Quiet 80 ignition problems


Yes that fan does come on.
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Old 10-18-2011, 11:44 AM   #18
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Gas Furnace Ruud Super Quiet 80 ignition problems


I have cleaned out the hose and the entrance it goes into. It has two switches how would I know if they are bad?
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Old 10-18-2011, 11:49 AM   #19
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Gas Furnace Ruud Super Quiet 80 ignition problems


Then pull the doors off of the furnace, remove the hose from the inducer, not the switch, and with the furnace door safety switch taped down or pushed in (you'll see the door switch under the door on the furnace once you remove said door) and the stat calling for heat, suck hard on that hose. If you sucking on the hose while the inducer is running closes that switch and the burners come on then it's either the hose or the switch.

I know it sounds funny but it it what it is. The draft inducer motor produces suction through that hose to pull the spring closed in the switch, allowing continuity of that electrical signal to go back to the board, allowing the furnace to ignite.
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Old 10-18-2011, 02:24 PM   #20
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Gas Furnace Ruud Super Quiet 80 ignition problems


Yes the fan comes on for a while, then everything shuts down.
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Old 10-18-2011, 03:15 PM   #21
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Gas Furnace Ruud Super Quiet 80 ignition problems


Quote:
Originally Posted by Elsinore View Post
Yes the fan comes on for a while, then everything shuts down.

So did you try what I stated earlier?

Operation
  • When a furnace begins a new cycle, the draft inducer blower fan begins whirring 30-60 second before the furnace burners actually ignite. The fan motor must also run properly and usually has a safety pressure switch connected to the fan housing. Pressure switches ensure that the motor is running according to the manufacturers' specifications. If the inducer fan motor cannot turn on, the furnace will generally shut off and lock out. Several other reasons may also cause the draft inducer blower to ultimately shut down a furnace. These include a faulty pressure switch, a bad rubber tube component, or there may be a blockage in the gas vent flue, or even the blower itself may not be working properly.


Read more: What Is a Furnace Draft Inducer Blower? | eHow.com http://www.ehow.com/about_6648692_fu...#ixzz1bA8BNvBs

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