For use in Rinnai E-series condensing boiler models: E50C, E50CN, E50CRN, E60SRN, E60SRP, E75CN, E75CP, E75CRN, E75CRP, E85SRN, E85SRP, E110CN, E110CRN, E110CP, E110CRP, E110SRN, E110SRP
PLEASE NOTE; INSTALLATION INSTRUCTIONS FROM MANUAL: Replace
the control unit. Remove the E-Prom from the defective control unit and place
it onto the new control unit. The controller will automatically load the
program into the new control unit." The E-Prom is the little circuit board that extends from the main board (circled in red in last picture). It slides right right out.
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