11
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Rinnai · Tankless Water Heaters
Ignition failure: burner did not ignite.
Quick Answer
Error code 11 on your Rinnai Tankless Water Heaters means: Ignition failure: burner did not ignite.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Confirm gas supply is on and fuel type matches unit.
2
Power cycle once and retry.
3
Check venting for blockage.
4
Have contractor verify inlet gas pressure and spark.
5
Service ignition components as required.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
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