Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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Clearing Error Code History
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
switches or MIN and MAX buttons.
After repairing the water heater the existing error code history should be cleared. This will
allow fresh data to be stored and reduce the risk of confusion should it be necessary to
service the water heater in the future.
To clear the error code history:
1. Ensure all controllers (if fitted) are turned off and all hot taps are closed.
2. Remove the front panel of the water heater.
3. Ensure all DIP SWITCHES are in the off position (down position).
4. Turn DIP SWITCH 1 on (up position) and then off (down position) again.
5. Within 5 seconds of turning DIP SWITCH 1 off, press and hold either the MIN or MAX
button for more than 2 seconds.
6. Refit the water heater front panel.
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.
To reset Error Code 99 it is necessary to:
1. Ensure all controllers (if fitted) are turned off and all hot taps are closed.
2. Ensure all DIP SWITCHES are in the off position (down position).
3. Turn DIP SWITCH 2 on (up position) and then off (down position).
4. Within 5 seconds of turning DIP SWITCH 2 off, press and hold both the MIN and MAX
buttons for more than 2 seconds.
5. Refit the water heater front panel.
Fault Finding
When measuring resistance of a part, turn off the electric power and be sure to
disconnect the part completely before measuring (from connector or terminal).
Resistance checks are performed on the part while it is disconnected from the
control board.
“Live” testing to be conducted. Personal Protective Clothing (PPE) shall be
worn to reduce the risk of electric shock. Refer to Rheem Safety Procedure
on electrical testing.
All Molex connections only go to one location and fit one way. You do not need to
force a connection. Connections are also colour coded to aid in reassembly.
CAUTION: When performing maintenance and/or servicing the water heater,
wait for the water heater to become cool. Be careful to avoid injury on the
sharp edges.