When an alarm sounds, protect the vessel first, reduce load and identify the indicator. Do not rely on memory. Keep a labelled panel diagram near the helm.
Low oil pressure
Stop as soon as navigationally safe. Check actual oil level after settling, visible leaks and whether the engine noise changed. A loose sender wire can trigger an alarm, but continue only after pressure is independently verified.
High coolant temperature
Reduce load. Check exhaust-water flow from a safe position. Stop for loss of water flow, steam or rapidly rising temperature. Do not open a hot cap. Follow the overheating guide.
Charging alarm
Inspect belt condition and battery voltage. A broken belt may also drive a coolant pump on some engines, turning a charging fault into an overheating emergency. Reduce unnecessary DC load. Do not disconnect batteries with the engine running.
Exhaust-temperature alarm
This often indicates reduced cooling water in a wet exhaust. Stop before hot gas damages hose and creates fire or fume risk.
Electronic fault or derate
Record the exact code, rpm and conditions before cycling power. A code identifies a circuit or operating condition, not always the failed component. Check supply voltage, connectors and service information before replacing sensors.