Resetting Error Codes; Test Equipment - Rheem II Series Service Instructions Manual

RESETTING ERROR CODES

Most Error Codes can be reset by shutting off the hot water flow and turning the controllers
(if fitted) off and then on again. It may also be necessary to isolate and restore the power.
Where controllers are not fitted it may be necessary to turn the power off at the water heater
to clear the error code.
Voltages up to 240 volts will be present within the water heater, take care
not to touch wiring terminals. Use an insulated tool when operating the
DIP switch or MIN and MAX buttons.
To reset Error Code 99 it is necessary to:
1. Ensure water is not flowing through the water heater.
2. Turn off remote controllers (if fitted).
3. Ensure all DIP SWITCHES are in the off position (down position).
4. Turn DIP SWITCH 2 on (up position) and then off (down position).
5. Within 5 seconds of turning DIP SWITCH 2 off, press and hold both the MIN and MAX
buttons for more than 2 seconds.
6. "UL" will flash in the LED display and then become steady.
7. Turn on a controller (if fitted) then open and close a hot water tap to complete the
procedure.

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
Wiring Colour Code
R: Red
W: White
Br: Brown
BK: Black
BL: Blue
GY: Grey
G: Green
O: Orange
Y: Yellow
Y/G: Yellow / Green
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"
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