Cummins/Onan VTA28-G2 Engine Engine

• STOPPING SET AT CONTROL PANEL SC-1609
• Set-mounted circuit breaker tripped.
  Fix: The optional line circuit breaker mounts on the generator conduit box. If the load exceeds the circuit breaker current rating, the circuit breaker will trip.
• REMOTE STOP lamp lights.
  Fix: This fault function is programmed to shut down the set immediately, as in the case of an Emergency Stop pushbutton. The nature and location of the fault is an optional selection that is determined when the set installation is designed. Refer to specifics of on-site equipment.
• PRE LO OIL PRES lamp lights. Engine continues to operate.
  Fix: If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedure in step 5.
• PRE Hi ENGINE COOLANT TEMP lamp lights. Engine continues to operate.
  Fix: If generator is powering non-critical and critical loads, and cannot be shut down, use the following: a. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. c. Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 6.
• PERMISSIVE AUTOMATIC START SWITCH SC-1610
• LOW BATTERY VOLTAGE lamp lights.
  Cause: Poor battery cable connections: Clean the battery cable terminals and tighten all connections.
• LO OIL PRES lamp lights. Engine shuts down.
  Cause: Indicates engine oil pressure has dropped to 12 psi (88 kPa).
  Fix: Check oil level, lines and filters. If oil system is okay but oil level is low, replenish. Reset control and restart. Contact your distributor if oil pressure is not in the range of 50 to 90 psi (345 to 620 kPa).
• LO FUEL lamp lights.
  Cause: Indicates diesel fuel supply is running low.
  Fix: Check fuel supply and replenish as required.
• LO ENG TEMP lamp lights.
  Cause: Indicates engine coolant heater is not operating (Lamp lights when engine coolant temperature is 70°F (21°C) or lower.).
  Fix: Since the lamp goes out after the engine warms up, there should be no cause for alarm if it remains lighted during initial generator set operation.
• HI ENG COOLANT TEMP lamp lights. Engine shuts down.
  Cause: Indicates engine has overheated (engine coolant temperature has risen above 223°F/106°C) or coolant level is low (sets with coolant level sensor).
  Fix: Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt, tighten if loose. d. Reset control and restart after locating and correcting problem. Contact your distributor if none of the above applies.
• GEN SET UNDER LOAD lamp lights, when attempting to start generator set, EXCITER SWITCH trips to OFF position.
  Fix: Remove all loads from generator set. Reset Exciter Switch to ON position.
• Engine will not crank.
  Cause: Also refer to LOW BATTERY VOLTAGE, step 15.
• Engine starts from Manual Start controls but will not start automatically or from a remote panel.
  Cause: The Automatic Start switch must be in the Auto position for automatic or remote starting.
• Engine runs and then shuts down, OVERSPEED lamp lights.
  Cause: Indicates engine has exceeded normal operating speed.
  Fix: Contact your distributor for service.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan VTA28-G2.

• VOLTMETER COOLANT
• VOLTMETER COOLANT
• Engine fuel may not be primed at the fuel filters after
• Tighten the filter an additional one-half to three-

Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.