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7.4 Fault Finding
Symptom
Pilot will not enter Auto mode.
Autopilot drops back into
Standby Mode.
Cannot select Nav Mode
Autopilot will not allow rudder
travel limits to be set*.
Autopilot does not maintain an
accurate course in Auto Mode.
Compass will not auto calibrate
BoatÕs course is unstable when
in Auto mode.
Probable Cause
Rudder limits not entered*.
Rudder limits configuration
failed*.
Faulty connection to SLF12*
Faulty connection to SHS12.
Fault with SCP12* / SRD12 .
Low supply voltage to Drive
Unit or Course Computer*.
Navigational data not avail-
able.
Incorrect NMEA format or sen-
tences are being transmitted.
Destination not programmed
in navigator.
Power cable gauge too small.
SLF12 incorrectly wired or
installed.
Pump not primed or airlocked
Buttons not pressed properly
SHS12 compass has not been
calibrated.
SHS12 compass is encounter-
ing magnetic interference.
¥ If the boatÕs magnetic
compass is being used as a ref-
erence, it is more likely that
this is inaccurate unless it has
being recently swung.
Turn rate too fast/slow
Conditions too rough
Deviation detected is too large
Gain setting is incorrect for
boatÕs speed or type.
Remedy
Enter rudder limits* (see 6.3)
Check all connections.
Replace fuse.
Check battery charge.
Check all electrical connec-
tions and supply cables.
Check NMEA connections.
Refer to section 7.3 for correct
NMEA0183 sentence formats.
Check recommended cable
sizes (Fig 4.17)
Check SRP12 & SLF12 wiring
and installation.
Prime pump & bleed system.
Refer to section 6.4 to calibrate
the compass to compensate for
magnetic deviation.
Check area around SHS12 for
magnetic objects (loudspeak-
ers, heavy current carrying
cables etc). Minimum com-
pass safe distance is 1m (3 Ft).
Check course against other
reference (handbearing com-
pass etc) and swing boatÕs
compass if necessary.
Flashing LEDs above
Port/Starboard keys indicate
if turn rate is too fast or slow.
Calibration should be attempt-
ed in calm conditions
Check area around compass
for metallic objects/speakers
etc (min safe distance - 1m/3ft)
Adjust Gain to suit boatÕs
speed: Low Speed=High Gain
High Speed=Low Gain
* - AP12H only † – AP12R only
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