MATCHING PROCEDURE
For Microprocessor Control Panel Boards
This procedure enables the temperature sensors to be properly matched to the controls microprocessor and is required after replacing a control panel board. Also, it may be necessary to perform the matching procedure to an existing control board after adjusting or replacing Temperature sensors, Temperature sensor Wires or resetting a High Limit Switch.
- 1. TURN OFF ALL POWER to the heater. Note: many models have multiple power circuits and breakers.
- 2. RUN COLD WATER through the heater for approximately 5 minutes to allow the heater to cool down and to allow the chamber temperature to become uniform.
- 3. With the power off and water running, DISCONNECT ONE OF THE HIGH LIMIT WIRES (brown wire) from near the top of the control board.
- 4. TURN THE POWER ON to the heater. The control board will beep and the LED will flash red and green. This is normal.
- 5. LOCATE THE BLUE BUTTON on the control board, located left side of the board below the thermostat knob.
- 6. PUSH & HOLD BLUE BUTTON in continuously for about 10 seconds, then release.
- 7. After releasing the blue button, there should be a distinct LOW TONE BEEP. This is the confirmation tone that the match was successful. If no low tone beep is heard, go to the previous step #6 and try again*.
- 8. After confirmation tone is heard, TURN OFF ALL POWER to the heater.
- 9. RECONNECT THE BROWN WIRE to the control board.
- 10. TURN ON ALL THE POWER to the heater, make sure all the breakers are on.
* If the no confirmation tone is received after 3 or 4 attempts, then check the temperature sensors and temperature sensor wires with the ohm meter. Go to the Component Testing Table for expected ohm readings.
