Simrad AP25 Autopilot
140 20221495F
Display readout Probable fault Recommended action
Shallow water The depth is inside
the set limit or outside
the range, i.e. 100 m
(328’)
Depth data is missing.
1. Carefully observe the actual
depth.
2. Adjust the alarm limit if not
hazardous.
3. Steer to safe depth, the alarm
will reset automatically.
4. Turn off the shallow alarm if
depth data is missing (Page
54).
Compass data
missing
No data from selected
compass.
1. If more that one compass is
connected to the system, refer to
the User Setup2/Source select
menu to select a different
compass.
2. Make a source update if no
compass is available.
3. Check connections.
4. Replace compass PCB (Note: Do
not cut cables. There are screw
terminals inside).
Rudder feedback
failure (not
applicable for
Virtual feedback
installations)
Rudder feedback
signal missing or
erratic
1. Check all connections.
2. Check the alignment as per the
installation instructions
3. Replace rudder feedback unit.
Rudder response
failure
No response to rudder
command
1. Check all connections
2. Check Rudder FB transmission
link (not applicable for Virtual
feedback installations).
3. Check drive unit motor/brushes.
4. Replace the Autopilot Computer
Power PCB.
Rudder too slow Excessive load on
steering gear. Air in
hydraulic system.
Insufficient drive unit
capacity.
1. Look for mechanical
obstructions at the rudder/tiller/
quadrant. Check the back drive
force.
2. Bleed the hydraulic system.
3. Replace with bigger pump unit.
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