Rheem 871018 - Page 24

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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.
When a fault occurs, an error code and sequence number will alternate in the LED display.
The Sequence Number Table below indicates the section of the operational sequence
(boxed numbers on the left hand side of the operational flow chart) where the fault
occurred.
Sequence Number Table
Sequence Number
- 0 to -9
A0 - A9
P0 - P9
C0 - C9
E0 - E9
H0 - H9
J0 - J9
L0 - L9
U0 - U9
Operational Flow Chart Section
1
2
3
4
5
Circled numbers, adjacent to the component or function, indicate the diagnostic test point
required to diagnose the fault. Refer to the table on page 29.
By locating the Error Code (displayed on the water heater or remote controller) 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 on the Operational Flow Charts
P.G.F.R Valve
Proportional Gas Flow Regulating Valve
I.C
Integrated Circuit
G.I.S.V.
Gas Inlet solenoid Valve
S.V. 1
Solenoid Valve 1
O.H.L
Over Heat Limiter
S.V. 2
Solenoid Valve 2
C.I
Combustion Indicator
S.V. 3
Solenoid Valve 3
F.F
Flame Failure
Stepping gas rate change sequence by solenoid
Model
Step 1
Step 2
Step 3
Step 4
18/20L
S.V. 1 ON
S.V. 2 ON
S.V. 1 & 2 ON
24/26L
S.V. 1 ON
S.V. 2 ON
S.V. 1 & 2 ON
S.V. 1, 2 & 3 ON
Burner Configuration (Burner Change-Over Assembly)
Model
Burner 1
Burner 2
Burner 3
18/20L
Right Solenoid
(S.V. 1)
Left Solenoid
(S.V. 2)
24/26L
Centre Solenoid
(S.V. 1)
Left Solenoid
(S.V. 2)
Right Solenoid
(S.V. 3)
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