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.
0
Opp. Score
49
Reports
1
Severity
4High
Trend
0%
stable
First Seen
Jun 2, 2026
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