No Error Code Fault Finding - Rheem 874W27NF Service Manual

NO ERROR CODE FAULT FINDING

Is the unit used as
an in-series gas
booster?
YES
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
Read
NO maintenance
information 1y
1y = Water flow
detected by water
flow sensor
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Is 1y displaying a
flow greater than YES
2lpm?
NO
Is water flow
through unit greater NO
than 2lpm?
YES
Is the voltage
between terminals 2
& 3 at connector S NO
normal?
Test 5
YES
Is the voltage
between terminals 1
& 2 at connector S
normal?
Test 6
NO
Is the flow sensor
turbine jammed? YES
Test 7
NO
Replace the PCB assembly.
Open hot tap further/clear
strainer.
Replace the PCB assembly.
YES
Free the flow sensor turbine.
Replace the water flow sensor.
874W Series models are not
suitable for use as in-series gas
boosters.
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