Error Code 51 - Rheem 874W27NF Service Manual

Error Code 51

False Flame Detected.
Error Code 51, 72, 80
Does the flame extinguish
completely after shut down?
YES
Display maintenance information
„0y‟ on remote control.
Does flame detection
maintenance information „0y‟
indicate 01?
YES
Detach flame sensor connector
from terminal U on control PCB.
Display maintenance information
„0y‟ on remote control.
Does flame detection
maintenance information „0y‟
indicate 01?
YES
Replace the control PCB.
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
NO
NO
NO
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Replace gas valve assembly.
Isolate power supply for 10
seconds to clear error code.
Restore power. Continue fault
diagnosis if an error reoccurs.
Clean or replace the flame rod
electrode.
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