DIAGNOSTIC MODE
►Press and hold down the “Temperature” button until you hear a short,
In this mode, pressing the “Time” button will also display the PWM output power duty cycle. This is shown as a percent for the corresponding heater.
The thermocouple calibration system can only be accessed from within the diagnostic mode.
►THERMOCOUPLE CALIBRATION SYSTEM
Make sure heater zone to be calibrated is at temperature and stable. Measure actual temperature and proceed with following procedure.
Enter “Diagnostic Mode” by pressing and holding down the “Temperature” button. After a second or so, the actual temperatures as measured by holding cabinet are displayed.
Use “Up” or “Down” buttons to select either the upper or lower heating zone for each bin.
Press “Bin” select button to select bin containing heating zone to be calibrated.
Note: Bin display will alternate between showing temperature and calibration offset. As the calibration offset is changed the temperature displayed will reflect this.
Use the “Up” and “Down” buttons to make the displayed temperature match the actual temperature as independently measured.
To apply the temperature calibration correctly, press and hold the “Temperature” button down. While pressing the “Temperature” button, press “Program” button (for 1 second) until the unit beeps.
Once program in completed the temperature correction is applied and the heater zone will adjust its temperature. The user interface returns to the actual temperature display.
Once a bin is selected for programming, if no keys are entered for 10 seconds the calibration mode is terminated and the display returns to actual temperature display mode.
►THERMOCOUPLE FAULT DETECTION
The thermocouple (TC) fault detection logic is disabled for 10 minutes following initial power application. This allows time for all heating zones to develop enough heat to not trigger a shorted thermocouple fault.
10 | Holding Cabinet – Service Manual |