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Hello, my name is***** am a plumbing contractor.
I looked up an error code 10 and this is the result.
Air intake or flue blocked.
Have you inspected the exhaust pipe, this time of the year it could ice up.
Let me know what you find? I have worked on rinnai as well as taken a certification course on rinnai hot water heaters and am happy to help troubleshoot.
This is the manual that I found online.
This is a troubleshooting guide provided to professionals, It looks like this guide says to look the dip switch settings and heat exchanger. If the unit is new I would look at the dip switches if the unit is older I would look through the combustion port to see if the flame draws well towards the exhaust. Please don't try anything on this guide without checking with me or Rinnai.
I will contact Rinnai this morning to find out the correct switch settings. Is this an AU model?
I will post back in the today.
I was not able to get your dip switch settings they Rinnai USA could not help and Rinnai AU wants me to be an Au tech, I'm sorry.
If you look on the back of the cover for an instruction sheet probably in a plastic bag, in the US, the dip switch setting are there. Let me know if you find them.