Cummins/Onan QST30 — Digital Coolant Temperature Display Calibration
Adjustments · PCC digital display
For the Cummins/Onan QST30, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFHA, Cummins/Onan DFHB, Cummins/Onan DFHC, Cummins/Onan DFHD, Cummins/Onan QST30, Cummins/Onan QST30 engine
Procedure
- With generator set OFF, replace coolant temperature sender with precision resistor in calibration tool.
- Select >> from Main Menu, proceed to COOLANT TEMP L menu.
- Calibrate temperature reading to match calibration tool.
- Repeat step 32 for COOLANT TEMP R if engine uses two sensors.
- Select EXIT if no calibration; SAVE then EXIT if calibration made.
Tools required
- precision resistor (engine sensor calibration tool) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DFHA →, Cummins/Onan DFHB →, Cummins/Onan DFHC →, Cummins/Onan DFHD →, Cummins/Onan QST30 →
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.