HVACDiagnostics & Troubleshooting

A 3-year-old Rinnai RU199i tankless water heater intermittently fails to ignite with Code 11, even after replacing flame rods and checking filters, and the problem recurs unpredictably.

Opp. Score

Reports

Severity

4High

Trend

100%

declining

First Seen

Jun 2, 2026

Problem Reports (1)

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