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Cummins/Onan — Check the load sensor board components using the

For these Cummins/Onan models: 15.0 HA - 21 - a, 7.5 HA - 21 - a.

Applies to: Cummins Onan 15 0 Ha 21 A, Cummins Onan 7 5 Ha 21 A

Procedure

  1. 1. Place the control in the “MANUAL” position if the sensor board is mounted in the control. Check components starting at the left side of the board with an ohmmeter set at R X 100 scale.
  2. 2. The first resistor should be 680 ohms +10% (Spec A). Spec B resistor (R3) should be 47 ohms +10% (240-volt control) or 24 ohms +10% (120-volt control).

Source: manual:907-0500 Onan HA Auto Demand Control Service Manual (06-1984).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.