Navman FISH 450 Tricolor Installation And Operation Manual page 23

While in Auto Range, the unit will flash the last
depth displayed, then display "--.-" to indicate
that there is no bottom detected. A display of
the bottom should reappear when it is shallower
than 300m (1000 ft).
4. Bottom echo disappears or erratic digital
reading while your boat is moving:
a) Ensure the bottom surface of the Aquaducer is
angled approximately 5° forward and as low as
possible in order to minimise the generation of
bubbles through cavitation. See Mounting the
Aquaducer section 5-3.
b) The transducer may be in turbulent water. Air
bubbles in the water disrupt the echos returned,
interfering with the FISH450 Tricolor's ability to
find the bottom or other targets. This often
happens when you reverse the boat. The
transducer must be mounted in a smooth flow of
water in order for the unit to work at all boat speeds.
c) Electrical noise from the boat's motor can
interfere with the FISH450 Tricolor. Try some
suppression spark plugs.
5. Fuel Used and/or Remaining amount(s)
seem incorrect:
a) Running the engine without the FISH450 Tricolor
turned on will result in the fuel used (Used) not
being recorded. This means that the fuel remaining
(Remaining) value will read higher than what is
actually in the tank. Installing the unit in the Auto
Power configuration will solve this problem, as the
unit is powered on and off automatically when the
vessel's power is switched on and off.
b) Incorrect readings may be caused by fuel surging
back and forward through the transducer in rough
seas. Try installing a one way valve between the
fuel transducer(s) and the fuel tank.
c) Fuel Remaining must be set to the amount of
fuel on board after every refuelling.
d) Air pockets when filling the tank may have
caused the tank to not fill completely.
e) Calibrate the fuel transducer after 100 litres have
been run through - so the turbine shaft beds
into the bearings correctly.
f) Fuel transducers wear out over time and should
be replaced every 5000 litres of fuel.
g) Also check all other fuel problems listed in the
troubleshooting guide.
6. No/low fuel flow (Flow) indicated:
a) Check the fuel cable connectors are securely
plugged in and the collar is locked in place. The
collar must be secure for water tight connection.
b) The fuel transducer(s) must be installed after a
fuel filter or they may clog. To clear a clogged
fuel transducer(s) remove the transducer(s) from
the line and gently blow through the tranducer(s)
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in the opposite direction to the fuel flow.
c) Inspect the fuel cable(s) from end to end for
damage such as cuts, breaks or squashed
sections.
d) Check that the fuel filter(s) in the line are clean.
e) Ensure that the fuel flow transducer(s) has not
been exposed to excessive heat or vibration.
7. Only one flow rate value shown for a twin
engine installation:
a) In the Setup Fuel menu Num Engines must be
set to 2.
8. Erratic fuel flow readings:
a) The mounting position of the fuel flow transducer
must not be too close to the fuel pump(s) and
not subject to excess vibration.
b) Check for air leaks in the fuel hose(s) or fuel
pick-up(s) in the tank(s).
c) The filtering level (averaging) has not been set
to suit the engine(s). In the Setup Fuel menu,
increase the Flow Filter value until a steady flow
rate is indicated. Check the fuel flow (Flow)
readings are not zero.
9. No fuel economy reading:
a) For the FISH450 Tricolor to be able to calculate
an economy reading, the boat must be
displaying a speed greater than zero.
b) Check the paddlewheel on the Aquaducer is
spinning freely. Check that the two magnets in
the paddlewheel are in place.
10. Over temperature warning message
displayed:
a) Error message. "Warning: Temperature exceeding
70°C. Reduce temperature to improve colour
clarity." Press the Alarm key to acknowledge
message and reduce the temperature of the unit.
11. If the unit beeps when turned on but
nothing is displayed:
a) The unit may be operating, but the display's
calibration settings (Red Cal, Blue Cal, Display
Cal. See section 4-6) may have been set too high
or low. Reset the display defaults so the unit
displays normally. While the unit is off, hold the
Cursor Right key and while holding it, hold the
Power On key. See section 4-9 for default values.
12. The unit is setup in such a way that the
user is not sure what to adjust to get it
operating normally:
a) The units factory defaults can be restored to
reset the unit a known configuration. See
Resetting to factory defaults section 4-9.
13. The wrong language is displayed:
a) See Getting Started section 2 on how to change
the language without using the menu system.
b) See Setup Language section 4-8.
NAVMAN
FISH450 Tricolor FISHFINDER Installation and Operation Manual