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What's the brand and model number of your unit?
A 10 error is a blocked exhaust vent ot air supply error
That's what the error indicates. If the combustion air supply is not a problem then there could be something in the fan that's restricting exhaust air flow.
What's your elevation?
Then the installe rhad no reason to touch the dip switches. The dip switch setting are only changed for high altitude installs.
I can't access the install manual at this time so I can't say.
Typical settings for most/all Rinnai models for under 2000' is 1 ON the rest off
To clarify the above refers to switch bank 1 which is the only bank related to venting. Do you have more questions?