Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Autopilot manual
- Control-head alarm codes
- Steering-system diagram
Step-by-step instructions
Record the refusal mode
Note whether the unit powers up but rejects AUTO, trips immediately or shows a drive or compass warning.
Check navigation context
Confirm the vessel is under manual control in safe water and the required heading source is available.
Review displayed alarms
Write down exact errors relating to rudder reference, drive current, heading sensors or control connections.
Inspect safe visible connections
Look for obvious moisture and cable damage only with equipment correctly isolated.
Arrange targeted service
Use the manufacturer’s diagnostics and a marine electronics technician for drive or steering faults.
Safety note
Never let an unreliable autopilot steer in close quarters or rough weather while troubleshooting. Maintain manual helm control.
Key takeaway
The exact alarm and operating mode are more useful than repeated reset attempts.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.