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I'm a Rinnai factory trained and certified repair technician. Error code 10 is vauguely based off of venting. Is this an interior or exterior unit.
What part of the country do you live in?
How handy are you? Do you feel comfortable removing the cover and doing some diagnostics?
Okay does it code 10 immediately?
Meaning does it fire at all?
Remove the cover
Four phillips head screws
The long vertical plastic grey bars on the side slide off if you pull the them to the right on the right one and to the left on the left one
Remove part #142 in picture below
I don't remember the number but you are only removing the top plate that runs horizontally
They shouldn't be that tight.
Okay let me tell you whats happening and then you can get a local tech. Its not getting enough air or it cant get rid of it. This can happen if the fins of the heat exchanger get plugged with condensate residue. It should be blown out with an air compressor and a vacuum