Error code 11 on a Rinnai tankless water heater indicates a "No Ignition" error, which means that the unit is not detecting a flame when it tries to ignite the gas burner. This error can be caused by several factors, including:
Gas supply issues: Check that the gas valve is open and that there is a sufficient supply of gas to the unit.
Ignition problems: Make sure that the igniter is functioning properly and that there is no debris or buildup blocking the burner or flame rod.
Venting issues: Check that the venting system is free of blockages and that the unit is properly installed with the correct venting materials.
Electrical issues: Ensure that the electrical connections are secure and that the unit is receiving the proper voltage.
If you are experiencing an error code 11 on your Rinnai tankless water heater, it is recommended to contact a qualified technician to diagnose and repair the issue.
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