Rheem 874W27NF - Test Equipment

15
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
About the Operational Flow Charts
The Operational Flow Charts provide information on the start up sequence and, in the event
a failure occurs at any point of the start up sequence, what error code will be displayed. Error
codes are displayed via the red LED mounted on the PCB.
The Sequence Number Table below indicates the section of the operational sequence
(boxed numbers on the operational flow chart) where the fault occurred.
Circled numbers, adjacent to the component or function, indicate the diagnostic test point
required to diagnose the fault. Refer to the table on page 21.
By locating the error code in the diagnosis charts the component/s or fault can be quickly
identified and tested using the diagnostic procedures outlined in this manual.
Notes and Abbreviations used in the Operational Flow Charts
P.G.F.R Valve
Proportional Gas Flow Regulating Valve
F.F
Flame Failure
G.I.S.V.
Gas Inlet Solenoid Valve (SV0)
S.V. 1
Solenoid Valve 1
O.H.L
Over Heat Limiter
S.V. 2
Solenoid Valve 2
I.U.I
In Use Indicator (Combustion Indicator)
S.V. 3
Solenoid Valve 3
Stepping gas rate change sequence by solenoid
Model
Step 1
Step 2
Step 3
027
SV1 ON
SV1 & 2 ON
SV 1, 2 & 3 ON
Sequence Number Table
Sequence Number
- 0 to -9
A0 - A9
P0 - P9
C0 - C9
E0 - E9
H0 - H9
J0 - J9
L0 - L9
Operational Flow Chart Section
1
2
3
4
5
Test Equipment
A list of test equipment which will assist in conducting diagnostic procedures is provided
below. This equipment is available from Rheem Service Spare Parts Department.
Flame detection simulator
WH0020080
Flame sensor current (uA) detection kit
WH0020081
Fine probe adapter kit
WH0020082
Heat exchanger fin brush
WH0020083
Probe to alligator clip kit
WH0020084