Rheem 70103 - Error Codes (701 & 702 Series Only); Error Codes (703 Series only)

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TM063 701, 702 & 703 Series Boiling Water Unit Service Instructions
Revision D: Feb 2017
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Error Codes (701 & 702 Series Only)
The Timer has a ‘Service Menu’ which can display alphanumeric error codes (refer to Error
Code Table below for error codes and their descriptions).
To access ‘Error Codes’ operate the Timer in the following manner:
1. Press and release the (P) button until ‘Service’ is displayed on the screen.
2. Press and release the (✓) button to confirm selection. Error codes will be displayed
on the screen with any error codes listed below.
3. Press and release the (X) or (✓) button to revert back to the main menu.
Note: An error code will be automatically cleared from the display when the fault pertaining
to that error code is rectified and the BWU re-powered.
Error Code Table
Code
Error
Code
Error
A*
Hot Thermistor O/C or S/C
H
Low Level Probe Fault
B
(1)
Chiller Unit Cold Thermistor O/C or S/C
J
High Level Probe Fault
C*
Triac S/C
K
(2)
N/A (Compressor Fault)
D
(2)
N/A (Leak Detection)
L
Boiling Water Heating Fault
E
Expired Filter
M
Watch Dog Software Reboot
G
Calibration Time Out
N*
Excessive Temperature Rise
Error code table notes:
Fault codes without an asterisk (*) are informational only and the BWU will continue to
operate however the affected section may not function.
Fault codes with an asterisk (*) displayed are critical faults. If detected, the BWU will shut
down and control board relay will de-energise. Refer to ‘Operational Flow Chart – 701 &
702 Series’ on page 11 for more information.
(1)
701 and 702 Series BWU’s do not have a chiller unit and therefore will display error
code B for firmware versions pre circa 2010.
(2)
Although all these error codes are available, they are not utilised by 701 and 702 Series
BWU’s.
Error Codes (703 Series only)
When the unit is performing an automatic recalibration ‘heating’ flashes on the control
panel.
A 701-702 series timer can be fitted to the 703 unit for fault finding purposes. Full
functionality of service mode parameters can then be utilised. It is recommended having a
proxy timer for servicing purposes.
Service Timer Kit Part Number 318130
The kit contains:-
Ribbon Connector Part Number 317167
Timer Part Number 316963