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Have you noticed ABNORMAL FLAME PATTERN upon startup like flame lifting and clouding up then blow out completely ?
I flame looks normal and it just shuts down...?
The issue is caused by the Flame rods. Near the 2 pilots at the front and the back. Those small rods each that 'senses' the flame become inadequate, so they need to be replaced with a new pilot assembly from Rinnai that has longer rods and better coverage.
Contact your Rinnai dealer for details for replacement parts.
Have a nice summer.