Cummins/Onan QST30-G5 (2P/2L) Engine Engine

• Warning lamp lights. MESSAGE: WEAK BATTERY 232 − WARNING 232
  Fix: Discharged or defective battery. See Warning message 230, LOW DC VOLTAGE.
• Warning lamp lights. MESSAGE: LOW FUEL DAY 240 − WARNING 240
  Fix: Check fuel supply and replenish as required.
• Warning lamp lights. MESSAGE: LOW FUEL 241 − WARNING 241
  Fix: Check fuel supply and replenish as required.
• Warning lamp lights. MESSAGE: LOW DC VOLTAGE 230 − WARNING 230
  Fix: A. Discharged or defective battery. Check the battery charger fuse. Recharge or replace the battery. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Contact an authorized service center if none of the above.
• Warning lamp lights. MESSAGE: HIGH DC VOLTAGE 231 − WARNING 231
  Fix: Contact an authorized service center.
• Warning lamp lights.
  Fix: Indicates battery voltage is below 24 VDC. a. Discharged or defective battery. Check the battery charger fuse. Recharge or replace the battery. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Contact an authorized service center if none of the above.
• Shutdown lamp lights. MESSAGE: MAG PICKUP 220 − SHUTDOWN 220
  Cause: Indicates mag pickup speed indication is not being sensed or does not match generator set output frequency.
  Fix: A. Restart and check RPM on the digital display. b. Contact an authorized service center.
• Shutdown lamp lights. MESSAGE: FAIL TO CRANK 221 − SHUTDOWN 221
  Fix: A. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. b. Discharged or defective battery. Recharge or replace the battery. c. Contact an authorized service center for service of starter and starting system.
• Shutdown lamp lights. MESSAGE: EEPROM ERROR 250 − SHUTDOWN 250
  Fix: Indicates PCC memory error. Data corruption of critical operating parameters. Contact an authorized service center.
• Shutdown lamp lights. Engine will not crank. MESSAGE: OVERCRANK 222 − SHUTDOWN 222
  Fix: A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary. c. Check for dirty or plugged air filter and replace if necessary. d. Reset the control and restart after correcting the problem. Contact an authorized service center if none of the above.
• Shutdown lamp lights. Engine will not crank. MESSAGE: FAIL TO CRANK 221 − SHUTDOWN FAIL TO CRANK 221 - SHUTDOWN
  Fix: A. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. b. Discharged or defective battery. Recharge or replace the battery. c. Contact an authorized service center for service of starter and starting system.
• Shutdown lamp lights. Engine stops cranking. MESSAGE: OVERCRANK 222 − SHUTDOWN OVERCRANK 222
  Fix: A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary. c. Check for dirty or plugged air filter and replace if necessary. d. Reset the control and restart after correcting the problem. Contact an authorized service center if none of the above.
• Shutdown lamp lights. Engine runs and then shuts down. MESSAGE: OVERSPEED 223 − SHUTDOWN 223
  Fix: Contact an authorized service center.
• Shutdown lamp lights.
  Fix: Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary.
• Engine stops cranking.
  Cause: Discharged or defective battery.
  Fix: Recharge or replace the battery. Clean the battery cable terminals and tighten all connections. Check engine DC alternator. Replace engine DC alternator if normal batery charging voltage (12 to 14 VDC) is not obtained.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QST30-G5 (2P/2L).

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