ST4000 no longer working

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Peter,

It is recommended that you inspect the location of the fluxgate compass to ensure that no high current carrying conductors and no objects which feature motors, magnets, or have been constructed of ferrous materials have been stored / installed within 3' of the fluxgate compass. If so, then these items should be moved at least 3' from the fluxgate compass and the autopilot should be tested again. If not, then it may indicate that the fluxgate compass (in spite of the testing performed) or autopilot course computer (in this case the ST4000) has suffered a failure. Unfortunately, Raymarine's Product Repair Center can no longer service ST4000/ST4000+/ST5000/ST5000+ autopilots. On a positive note, any compatible Raymarine actuator and rudder reference transducer which are presently installed onboard may instead be used with an Evolution autopilot. As a new Evolution autopilot is a sizable investment and given the age of your currently installed autopilot, you may want to consider testing your ST4000 with a new M81190 Fluxgate Compass (in sprite or your test results) before replacing the autopilot.