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  1. treitz28

    Rinnai R53 Issue - Sporadic Cold

    Hi all - new here, and trying to isolate a problem with our tankless water heater - Rinnai R53. The issue: When using the shower or sink, it producing hot water for a while. However, occasionally it will go cold (NOT showing an error code). If we turn the water off, then back on, it heats up...
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