There are a couple of things that can cause ignition problems:
The exterior direct vent termination may be clogged.
The gas line shutoff is not turned ON or is only partially open.
The filter needs cleaning. Be sure to turn the Master ON/OFF Switch to OFF before removing the filter. Leave it Off until the filter is cleaned and replaced.
All the above problems you can troubleshoot and solve yourself. The ones below, require an authorized Rinnai Service Technician to solve.
Spark ignition failure.
Faulty solenoids.
Faulty Flame Rod.
Hope this helped you to troubleshoot and solve the problem.
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