Cummins/Onan — Digital Board Replacement
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan OTPC
Before you start
- AC power within the cabinet and the inside of the cabinet door presents a shock hazard. Remove power to the door by disconnecting connector J1/P1 before working on the electronic control system.
Procedure
- Place the motor disconnect switch in the Off position.
- Disconnect connector P1.
- Remove the old digital board and install the new one.
- Connect connector P1.
- Use InPower to perform an initial calibration on the replacement digital board; select settings and features to match the nameplate values.
- Write a capture file to the replacement board, or set up individual parameters if no good capture file is available.
- Remove all power from the digital board, including the batteries, for the changes to take effect.
- Place the motor disconnect switch back in the On position.
Tools required
- InPower service tool Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.