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

Join the beta — full access for the first 1,000 builders

Join Beta