Cummins/Onan Energy Command 20 — SET Gen Hour Display
Operation · EC-20 controller
For the Cummins/Onan Energy Command 20, from the Cummins/Onan service manual.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKB, Cummins/Onan HDKC
Procedure
- If installed on an existing genset, record its hour-meter reading.
- Enter SETUP & INFO menu and navigate to SETUP GENSET display.
- Press ENTER, use DOWN key to select the SET gen hours display.
- Press SET; display says ENTER to unlock; press ENTER to continue.
- Display flashes; hold UP/DOWN until leftmost digit matches desired value.
- Release and wait four seconds for underline to move right, then scroll to next value.
- Set each successive digit to the right, then press ENTER to store.
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKB →, Cummins/Onan HDKC →
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.