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Old 01-29-2009, 05:37 PM   #1
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Ruud natural gas furnace occasionally will not turn on


About 15 yrs old, clean, yes some rust. Seems to run fine for a week, then will not turn on. Replaced electronic thermostat (but now know that was not the problem). Have removed thermostat and used jumpers to cause gas to open (flame, has pilot light) and use another jumper to start fan. But now that is not working consistently. Used multimeter and there is voltage with Red and White (gas) and Red and Yellow (blower). Is there a way to test the 3 sensors that are wired in a series? What is a typical - based on experience - cause… to help me to know where to start to look. Thanks!

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Old 01-29-2009, 07:38 PM   #2
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Ruud natural gas furnace occasionally will not turn on


I belive you are saying you have a standing pilot (IE: always lit) and upon a call for heat nothing happens. Is this correct? Then tell us what you have to do to get unit operating again. Also assuming your wires are color coded correct if you jump the R to Y you will be starting the outdoor a/c. R to G is the fan only.

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Old 01-30-2009, 01:11 PM   #3
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Ruud natural gas furnace occasionally will not turn on


Thank you for the comments. Last evening, furnance would not turn on no matter what I tried. So, have a service call in. I will update here with the result to add to this knowledge base.
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Old 01-30-2009, 04:42 PM   #4
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Ruud natural gas furnace occasionally will not turn on


Well it was the gas valve... brand: Robertshaw.
Must have been going bad for a while. That would explain the intermittent working. OK, purchased and installed right at $250. Now got heat!
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