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I have a Ruud acheiver 90 plus running on LP gas. It starts up and can run a few minutes or longer and then clunks a few times and the furnace shuts down.The clunking is coming from the gas valve. You can hear the power venting fan still running and then the furnace starts up again. It can do this once or 5 or 6 times before coming up to temperature and sometimes it doesn't do it at all. The unit is about 10 years old. Any thoughts?

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This might or might not help;

http://arnoldservice.com/Troubleshooting_Heating_Problems.htm

Posted on Oct 24, 2010

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