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36 ST7001+ Autopilot Control Unit - Owner’s Handbook
4 Fault Finding & Maintenance
4.1 Fault finding
Common autopilot problems
SYMPTOM CAUSE and SOLUTION
Display is blank No power – check the power and SeaTalk fuses
on course computer, then check main
fuse/circuit breaker.
Display shows stationary dashes The control unit is not receiving data – check
cabling.
Display shows rotating dashes Compass correction in progress (see page 64).
Displayed compass heading does
not agree with the boat’s compass
You have not calibrated the compass. Carry out
the deviation and alignment procedures (see
page 64).
No display bar on the display Rudder bar switched off in Display Calibration
– select RUDD BAR or STEER BAR
Rudder bar display moves in
opposite direction to rudder
Reverse the red and green rudder position
sensor connections at the course computer
Boat turns slowly and takes a long
time to come onto course
Rudder gain too low (see page 71). Complete
AutoLearn or increase setting.
Boat overshoots when turning onto
a new course
Rudder gain too high (see page 71). Complete
AutoLearn or decrease setting,
The autopilot appears to be
unstable in Track mode, or
track-holding is slow
If tide speed exceeds 35% of boat speed, and
boat speed is not available via SeaTalk, change
the Cruise Speed setting in Dealer Calibration
to the boat’s cruising speed (see page 99).
The autopilot appears to be
unstable on Northerly headings in
the Northern hemisphere (or
Southerly headings in the Southern
hemisphere)
Northerly/Southerly heading correction
(AutoAdapt) is not set up (see page 99). [Does
not apply to 150G/400G systems.]
You cannot enter Seatrial
Calibration
Seatrial calibration lock is on – turn off the
calibration protection feature in Dealer
Calibration (see page 92).
The autopilot will not ‘talk’ to other
SeaTalk instruments
Cabling problem – make sure all the cables are
connected properly.
Position information not received Navigator not transmitting the correct position
data.
The autopilot will not auto advance
to the next waypoint
No bearing to waypoint information received
from the navigator.