Cummins/Onan — Replacing the Display Module
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Interconnect the display module with lead harness Nos. 338-4087, 338-4088 and 338-4089.
- Check the label on the back of the display. It should indicate that it is calibrated for 20 kW.
- If not, recalibrate: Press the hidden Menu button twice and then the Mode button twice.
- The display will show the current kW setting.
- If not correct, press the Menu button as many times as necessary to select the correct setting.
- Once the desired setting has been selected, press and hold the Mode button and the Menu button to save the setting.
- Hold both buttons until the display returns to its normal display.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.