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Rinnai EX38CT wall heater rattle

Lakeleader Member Posts: 1
3-yr-old Rinnai heater started rattling about 2 wks ago. Rattle starts not long after burners turn on. Rattle seems to stop when burners stop firing. Blower motor keeps blowing and there's no rattle. I need a step-by-step on how to access the cause and repair or replace. Thanks.