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Old 10-15-2011, 10:13 AM   #1
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Gas Furnace Ruud Super Quiet 80 ignition problems


This furnace is a RUUD 2005 model UGLO-07EAMER. It has been having this same problem for the two years that I have owned this house. It works fine, until one day it will not start. One light is on and one is flashing. A technician came out 9 months ago and could not find anything wrong because it decided to work when he was here, then he shook some wires and the furnace came on and off, like there was a short, so he crimped the wires better and then it started up and worked fine. Last week it would not start in the morning but 2 hours later it did. Today it is not starting again. It has a clean filter and no vent restrictions.

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Last edited by Elsinore; 10-15-2011 at 10:15 AM. Reason: mispelling
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Old 10-15-2011, 11:25 AM   #2
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Gas Furnace Ruud Super Quiet 80 ignition problems


check the diagnostic flow chart to identify what the diagnostic flash code LED means

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Old 10-15-2011, 11:36 AM   #3
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Gas Furnace Ruud Super Quiet 80 ignition problems


The power led is on steady..the status led flashes and goes out...chart says to check for 24 vsc from W on IFC. to C.
Check wiring. check presure switch.

Last edited by Elsinore; 10-15-2011 at 11:49 AM. Reason: new info
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Old 10-15-2011, 11:42 AM   #4
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Gas Furnace Ruud Super Quiet 80 ignition problems


where is the noise from? you have to hunt this down. We cant do it for you over the internet.
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Old 10-15-2011, 12:39 PM   #5
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Gas Furnace Ruud Super Quiet 80 ignition problems


I found out that the noise is a circuit that clicks when the furnace comes on or shuts off.
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Old 10-15-2011, 12:48 PM   #6
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Gas Furnace Ruud Super Quiet 80 ignition problems


Are there any parts that I can clean, which may make the furnace work?

Thanks
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Old 10-15-2011, 12:56 PM   #7
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Gas Furnace Ruud Super Quiet 80 ignition problems


not from the sounds of your problem, no.
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Old 10-15-2011, 01:01 PM   #8
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Gas Furnace Ruud Super Quiet 80 ignition problems


Sounds to me like you could have a bad connection on the inducer fan pressure switch or the switch sensing tube has moisture in it, or the sensing tubing loose, or the switch itself is bad.

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Old 10-15-2011, 01:05 PM   #9
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Gas Furnace Ruud Super Quiet 80 ignition problems


I will take out the switch then and replace if can find the switch, where would it be in the furnace?
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Old 10-15-2011, 01:14 PM   #10
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Gas Furnace Ruud Super Quiet 80 ignition problems


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Originally Posted by Elsinore View Post
I will take out the switch then and replace if can find the switch, where would it be in the furnace?

Well looking at the manual for the furnace it appears to be just left of the inducer fan, its a round molded plastic switch with a plastic or rubber hose running from it to the inducer fan discharge.

http://globalimageserver.com/fetchDo...2-52c6c8224436

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Old 10-15-2011, 01:19 PM   #11
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Gas Furnace Ruud Super Quiet 80 ignition problems


What is the name of the switch so I can ask for it at the parts company?

Thanks
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Old 10-15-2011, 01:21 PM   #12
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Gas Furnace Ruud Super Quiet 80 ignition problems


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What is the name of the switch so I can ask for it at the parts company?

Thanks
Inducer fan pressure proven switch, at least that is what I call it.

Looks like

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Old 10-15-2011, 02:29 PM   #13
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Gas Furnace Ruud Super Quiet 80 ignition problems


I took the hose off and cleaned out the hole where the tube goes into the fan with a paper clip, and the hose had a small damaged spot so I taped up that. It is now working, so maybe I will not have to replace the switch, but it has worked before and stopped so I will just have to see. Thanks much for the help.
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Old 10-18-2011, 10:47 AM   #14
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Gas Furnace Ruud Super Quiet 80 ignition problems


This morning the furnace trys to start but will not blow hot air.
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Old 10-18-2011, 11:01 AM   #15
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Gas Furnace Ruud Super Quiet 80 ignition problems


Is the induer fan coming on? That's the little fan that exhausts the burned gases out through the exhaust flue pipe through your roof, has the little hose attached between it and the pressure switch.

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