Controller shows AL24 – Alternator Temperature High (if stator RTD fitted)

Safety first: Stop the generator and allow the alternator to cool. Isolate battery negative before opening covers.

• Inspect ventilation: Check that alternator air inlets and outlets are not blocked by debris or insulation.
• Check load history: Review recent load levels; continuous operation near or above rated kVA can overheat the alternator.
• Inspect temperature sensor wiring: Locate the stator RTD or thermistor leads in the terminal box and check for damage or loose connections.
• Reduce load: If the application allows, reduce the continuous load to within 80–90% of rated capacity.
• Professional testing: If overheating persists, have the alternator tested for internal faults or partial shorted turns.