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Home›Repair guides›Cummins/Onan›Accessing the Service Screens

Cummins/Onan — Accessing the Service Screens

Testing & diagnosis · Operator Panel / Inverter

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan HDZAA

Procedure

  1. Press Gen OFF.
  2. Hold down the START button and Display ON together.
  3. Release both buttons when RV QD 3200 is displayed.
  4. Immediately press the START button 3 times; GEN OFF should be displayed.
  5. Press the START button again to start the generator set.
  6. Once started, press START to view the service screens and use START to navigate.

Full service-parts list: Cummins/Onan HDZAA →

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.

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