TM090 12-26 Series II CFGWH Service Instructions
REV AB
– Issued February 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies
are deemed “uncontrolled”
21
HOW TO FAULT FIND
When conducting fault finding techniques it is important to understand that the same error
code with a different sequence number can be displayed at different points during the
operational sequence of the water heater. It is important to determine where the fault
occurred in relationship to the operational sequence of the water heater before commencing
fault finding tests, as the tests may differ even though the same error code can be displayed.
If a fault occurs the LED display will alternate between the error code for the fault and a
sequence number that indicates where in the operational sequence of the water heater the
fault occurred. The operational flow charts are broken into 5 sections designated by boxed
numbers. The table on page 22 converts the sequence number displayed on the LED to the
appropriate operational flow chart section.
The flow diagram below outlines the recommended procedure to successfully diagnose, test
and rectify faults on the range of water heaters.
1
Identify sequence number and error
code displayed on LED.
2
Convert the sequence number
to an operational flow chart
section number using the
sequence number table
3
Locate the operational
flow chart section
identified in step 2
4
Locate the error code within
the operational flow chart
section identified in step 2 and
take note of where the fault
occurred during the
operational sequence.
5
Using the fault diagnosis flow
chart locate the correct fault
finding flow chart to use.
6
Follow the fault finding
flow chart identified in
step 5 until the error
code displayed on the
LED is located.
7
Conduct the necessary tests
outlined to identify and rectify
the fault.
8
Additional information on components, performance and past
history can be gained from the maintenance information
stored in the PCB.