Cummins/Onan — Fan Function Test
Testing & diagnosis · Cooling fan
From a Cummins/Onan owner's manual covering: 1.5HJBAA, 2.0HJBAA, 2.5HJBAA, 3.0HJBAA. Check it applies to your exact model before use.
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Procedure
- Connect the batteries and check for 12 VDC across the Inverter-Charger terminals; verify the Charging Indicator Light blinks intermittently.
- Connect AC input; High Charging will begin and the fan should come on and blow air out the right side of the Inverter-Charger.
- If the fan does not function or a fan fault is declared after a few minutes of Charging, replace the fan assembly.
Tools required
- voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan owner's 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.