Rinnai Tankless Code 12

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dblynch90

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Feb 24, 2023
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Hi Everyone,

I just installed a Rinnai RUCS65ip model a few weeks ago in my garage to run my hydronic heated floors. I have had it running for a few weeks now without issue but just recently I keep getting a code 12. When the unit first fires up, I get a nice blue flame across all my burners and everything appears to be working fine. After about 10 minutes of running, I notice that a couple rows of burners are out. Eventually all the burners go out and the code 12 appears. I can restart the unit, all burners come on fine again, but again, after some time the same issue happens. Any thoughts?
 
You can google “ rinnai tankless code 12 “ and read all about it.
 

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