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Gas water heater won't ignite

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Posted: Tue Sep 8th, 2009 04:29 am

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tinkertech
Apprentice Appliantologist, First Class

Joined:	Tue May 12th, 2009
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Posts:	7
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This is a Noritz N-069M(OD) tankless water heater. It will try to ignite and sometimes will,but most of the time it won't. I changed out the ignitor and circuit board with no change. It's been in service for about three years.Do I need to clean the heat exchanger and how exactly do I do it? How would I bypass the gas valve to test if its faulty? Any info would be greatly appreciated!

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