Cummins/Onan KTAK4-2100 Engine Engine

• Over Current 1471
• Low AC Voltage 2331
• High AC Voltage 2358
• Weak Battery 1442
• Warning, Shutdown, and Non-Automatic lamps are not lit. Digital display shows main menu or selected menu.
  Cause: Indicates all engine systems are normal. No corrective action required
• Warning lamp lights.
  Cause: LOW COOLANT TEMP 210 – WARNING
  Fix: 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.
• Under Frequency 1448
• Too Long in Idle 2342
• The light will display the fault codes (active or inactive) in succession, starting with the most recent. Up to 32 (unacknowledged) fault codes can be stored in control panel memory. 213
• Speed/Hz Match 1469
• Speed Signal Lost 121
• Shutdown lamp lights. 212
  Cause: Indicates engine has overheated (coolant temperature has risen above the shutdown trip point: 223° F – standby / 215° F – primary) or the coolant level is low. Allow engine to cool down completely before proceeding with the following checks:
  Fix: A. Check coolant level and replenish if low. Look for coolant leakage and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check fan belt and repair or tighten if necessary. d. Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above.
• Shutdown After Battle Short 1123
• Short Circuit 1445
• Remote Emergency Stop 1434

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTAK4-2100.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.