Cummins/Onan NTA 855 G1 Engine Engine

• Undedicated fault. May be factory programmed as a shutdown or non-shutdown, and as a timed or non-timed (normally set for timed shutdown). FAULT 1 (red)
  Cause: @ FAULT 1 (red) an undedicated fault. May be factory programmed as a shutdown or non-shutdown, and as a timed or non-timed (normally set for timed shutdown).
• The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run.
  Fix: Indicates standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is timed delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay. but will not start automatically or from a remote panel. (Note: The Run/Stop/Remote switch must be in the Remote position for automatic or remote starting).
• SWITCH OFF lamp flashes.
  Fix: Indicates Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. Move the Run/Stop/Remote switch to the Remote position for automatic starting.
• Starter has been locked out because of excessive cranking time
  Cause: @ OVERCRANK (red) indicates the starter has been locked out because of excessive cranking time.
• Same features as Fault 1 (normally set for timed shutdown). FAULT 2 (red)
  Cause: @ FAULT 2 (red) same features as Fault 1 (normally set for timed shutdown).
• No AC output voltage.
  Fix: Field breaker is tripped. Reset breaker. Contact an Onan Dealer or Distributor if voltage build up causes breaker to trip.
• LO FUEL lamp lights. Engine continues to run.
  Fix: Indicates engine has run out of fuel. Check fuel level and replenish as required.
• LO ENG TEMP lamp lights.
  Fix: Indicates engine coolant heater is not operating or is not circulating coolant. Check for the following conditions: a. Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required. b. Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required. c. Contact an Onan Dealer or Distributor if none of the above.
• Green RUN lamp does not light following engine start-up.
  Fix: Indicates possible Start/Disconnect relay failure. Contact an Onan Dealer or Distributor for assistance.
• Generator set is not in automatic start operation mode
  Cause: @ SWITCH OFF (flashing red) indicates generator setis riot in automatic start operation mode.
• Fault lamp lights but no fault exists.
  Fix: The monitor board or a sensor may be at fault. Contact an Onan Dealer or Distributor for service.
• Engine will not crank.
  Fix: Indicates possible fault with control or starting system. Check for the following conditions: a. Fault jam on. Correct fault and reset control. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Discharged or defective battery. Recharge or replace the battery. d. Contact an Onan Dealer or Distributor for assistance if none of the above.
• Engine starts from generator control panel and restart.
  Fix: Contact an Onan Dealer or Distributor if breaker trips after resetting.
• Engine shuts down and LO OIL PRES lamp lights.
  Fix: Indicates diesel fuel supply is running low. Check fuel supply and replenish as required.
• Engine runs and then shuts down, OVERSPEED lamp lights.
  Cause: Indicates engine has exceeded normal operating speed
  Fix: Contact an Onan Dealer or Distributor for service.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan NTA 855 G1.