jthaxter
New Member
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 start/stop type of demand? No technician around here in AK seems to have an answer.