Rheem 871018 Service Instructions Manual page 24

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
Operational Flow Chart Section
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
G.I.S.V.
O.H.L
C.I
F.F
Model
18/20L
24/26L
Burner Configuration (Burner Change-Over Assembly)
Model
18/20L
24/26L
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
Flame sensor current (uA) detection kit
Fine probe adapter kit
Heat exchanger fin brush
Probe to alligator clip kit
Sequence Number Table
- 0 to -9
Gas Inlet solenoid Valve
Over Heat Limiter
Combustion Indicator
Flame Failure
Stepping gas rate change sequence by solenoid
Step 1
S.V. 1 ON
S.V. 1 ON
Burner 1
Right Solenoid
(S.V. 1)
Centre Solenoid
(S.V. 1)
A0 - A9
C0 - C9 E0 - E9
P0 - P9
1 2
Step 2
S.V. 2 ON S.V. 1 & 2 ON
S.V. 2 ON S.V. 1 & 2 ON
Burner 2
Left Solenoid
(S.V. 2)
Left Solenoid
(S.V. 2)
24
H0 - H9
J0 - J9
3 4
I.C Integrated Circuit
S.V. 1 Solenoid Valve 1
S.V. 2 Solenoid Valve 2
S.V. 3 Solenoid Valve 3
Step 3
S.V. 1, 2 & 3 ON
Burner 3
Right Solenoid
(S.V. 3)
WH0020080
WH0020081
WH0020082
WH0020083
WH0020084
L0 - L9
U0 - U9
5
Step 4