Cummins/Onan KTTA50 Engine Engine

• Warning Status Indicator: This yellow lamp is lit whenever the control detects a warning condition.
  Fix: After the condition is corrected, warning indicators can be reset by pressing the Reset switch. (It is not necessary to stop the generator set.) In auto mode, warning indicators can also be reset by cycling the remote reset input after the condition is corrected.
• Warning lamp lights. 210
  Fix: Indicates set is in standby mode but is not operating. Warning occurs when engine coolant temperature is 70 F (21 C) or lower. NOTE: In applications where the ambient temperature falls below 40F (4C), Low Engine Temp may be indicated even though the coolant heaters are operating. 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 authorized service center if none of the above.
• Shutdown Status Indicator: This red lamp is lit whenever the control detects a shutdown condition.
  Fix: After the condition is corrected, shutdown indicators can be reset by turning
• Shutdown lamp lights. 200
  Fix: Indicates engine oil pressure has dropped to an unacceptable level. If generator is powering critical loads and cannot be shut down, wait until next shutdown period then follow 201 Low Oil Pressure procedure. If engine can be stopped, follow 201 procedure. To check oil pressure, access Oil Pressure menu prior to clearing the fault.
• PCC memory error. Data corruption of noncritical operating parameters. Warning lamp lights. 251
  Fix: Contact an authorized service center.
• PCC memory error. Data corruption of critical operating parameters. Shutdown lamp lights. 250
  Fix: Contact an authorized service center.
• One or more of the phase voltages has exceeded 130% of nominal, or has exceeded 110% of nominal for 10 seconds. Shutdown lamp lights. 301
  Fix: Contact an authorized service center.
• Non-Automatic lamp flashes.
  Fix: Indicates Run/Off/Auto switch is not in the Auto position. This will prevent automatic starting if an automatic transfer switch is used. Move the Run/Off/Auto switch to the Auto position for automatic operation.
• Indicates engine coolant level has fallen below the trip point. Shutdown lamp lights. 220
  Fix: A. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Reset control and restart after locating and correcting problem. Contact an authorized service center.
• Fuel supply is running low. Warning lamp lights. 241
  Fix: Check fuel supply and replenish as required.
• Engine will not crank. Shutdown lamp lights. 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.
• Engine stops cranking. Shutdown lamp lights. 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.
• Engine shuts down and will not crank. 102
  Fix: Indicates local or remote Emergency Stop. To reset the local Emergency Stop button: Pull the button out or turn the switch clockwise (button with arrow) and allow it to pop out. Move the Run/Off/Auto switch to Off. Press the Reset switch. Select Run or Auto, as required.
• Engine runs and then shuts down. Shutdown lamp lights. 223
  Fix: Contact an authorized service center.
• Engine continues to operate at reduced RPM. 101

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTTA50.

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