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I'm the thread originator. I've replaced the board myself - it's an easy plug-n-play replacement. This didn't help though. I and plumbers talked to Rennai support repeatedly. They basically have no clue what's going on. They suggested to replace the pump but didn't guarantee this was the...

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Well, Rinnai didn't say anything meaningful and tried to send me to a certified plumber . So I gave up and called whoever installed them. So the guy called Rinnai from me and they mentioned a little detail missing from the manual. Before starting the system flushing, you'd have to get the heater...

I can’t get rid of code 63 on my hybrid Rinnai heater. The code keeps coming back intermittently. The manual says to (1) clean water filter, (2) check the water flaw and/or (3) clean the heat exchanger. I’ve cleaned the water filter twice - and the second time the filter was clean so it was...