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  1. jthaxter

    Rinnai code 12

    Our cabin has a Rinnai R53 tankless heater. It works fine, mostly. If the shower is on and one turns the sink water on, off, on, off, as when doing dishes, the heater throws a code 12. If the shower and sink are both on steadily, there is no problem. What causes the problem when there is a...
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