Chapter 4: Fault Finding & Maintenance 354 Fault Finding & MaintenanceAutopilot alarm messagesWhen the autopilot detects a fault or failure on the system, it willactivate one of the alarm messages listed in the following table.• Unless otherwise stated, you should respond to the alarm bypressing standby to clear the alarm and return to hand steering,before you attempt to resolve the problem.• In some situations, the autopilot will raise more than one alarm.When you have dealt with the first alarm, the autopilot willdisplay the next alarm.ALARM MESSAGE CAUSE and SOLUTIONAUTO RELEASE Possible fault with rudder position sensor – check connections.ORStern (I/O) drives only – you have taken manual control ofsteering with AutoRelease on. The alarm cancels automaticallyafter 10 seconds.CURRENT and LIMIT Serious drive failure – the drive is taking too much current dueto short-circuit or jamming. Check the drive unit.DRIVESTOP The autopilot is unable to turn the rudder (this occurs if theweather load on helm is too high, or if the rudder positionsensor has passed beyond the preset rudder limits or rudderend-stops).Check drive and rudder position sensor.LOW BATT Supply voltage has dropped below acceptable limits.To respond to a Low Battery alarm:• press standby to clear the alarm and return to hand steering• start the engine to recharge the batteryLRN FAIL 1, 2 or 4 AutoLearn not completed successfully.Failure codes:1 = AutoLearn has not been carried out (default setting)2 = AutoLearn failed, usually due to manual interruption4 = AutoLearn failed, probably due to drive or compass failureRepeat the AutoLearn procedure.MOT POW and SWAPPED Motor cables are connected to power terminals (and powercables are connected to motor terminals) at course computer.Turn off power and swap over connections.[Table continues over page]
