Appendix B - Troubleshooting - Navman FUEL 3100 Installation And Operation Manual

Appendix B - Troubleshooting

This troubleshooting guide assumes that this manual
has been read and understood.
It is possible in many cases to solve difficulties
without having to send the unit back to the
manufacturer for repair. Please follow this
troubleshooting section before contacting the
nearest NAVMAN dealer.
There are no user serviceable parts. Specialized
methods and testing equipment are required to
ensure that the unit is reassembled correctly and is
waterproof. Repairs to the unit must only be carried
out by a service centre approved by Navman NZ
Limited. Users who service the unit themselves will
void the warranty.
More information can be found on our Website:
www.navman.com
1 FUEL 3100 will not turn on:
a Power/data cable is damaged or disconnected.
Perform a visual check.
b Fuse is blown or circuit breaker has tripped.
Replace the fuse or reset the circuit breaker.
c Battery voltage is outside the range 10.5 to
16.5 V DC. Check the battery voltage using a
multimeter.
2 The word SIM flashes at bottom left corner of
screen, values displayed are unexpected:
a The FUEL 3100 is in simulation mode (see
section 2-6 Simulation mode).
3 Fuel reading is wrong or erratic:
a Check for leaks in the fuel line or in the fuel
pickup in the tank.
b Fuel transducer cable is unplugged or
damaged. Perform a visual check.
c Calibration is incorrect (see section 4-3 Fuel
setup).
d The fuel REMAINING reading is incorrect. The
fuel tank capacity (SIZE) may be incorrect, or the
fuel REMAINING setting may not have been
updated after a refill. See section 4-3 Fuel setup.
e The fuel flow transducer may have been mounted
too close to the fuel pump, or may be subject to
excessive vibration. Refer to the installation
instructions supplied with the fuel transducer.
f The Fuel Flow Transducer damping (dAmP.F)
value is not suitable for the engine. Check that
the value is not set to zero, and then try
increasing the value until a steady flow rate is
shown. See section 4-3 Setup > Fuel.
4 Speed reading is wrong or erratic:
a Speed transducer cable is unplugged or
damaged. Perform a visual check.
b Calibration is incorrect (see section 4-4 Speed
setup).
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c Interference from electrical noise may be affecting
the FUEL 3100. Review the installation (see
section 5-3 Installing the display unit, and section
5-4 Installing the Fuel Flow Transducer).
5 Low Fuel Alarm sounds when fuel tank full:
a The fuel REMAINING reading is incorrect. The
fuel tank capacity (SIZE) may be incorrect, or the
fuel REMAINING setting may not have been
updated after a refill. See section 4-3 Fuel setup.
6 The display unit fogs:
a Moist air has entered the breathing tube at the
rear of the unit. Air the boat or run the
FUEL 3100 with backlight fully on.
b Water has entered the breathing tube. Return
the FUEL 3100 for servicing.
7. Flow indicates no fuel or low fuel
a) Check that the fuel cable connectors are
securely plugged in and the collar is locked in
place. The collar must be locked in place to
give a watertight connection.
b) A fuel transducer may be clogged. If so,
remove the transducer from the fuel line and
gently blow through it in the opposite direction
to the fuel flow. A fuel filter between the fuel
transducer and the fuel tank must be installed
as per the fuel installation guide. Failure to do
so will void the warranty.
c) Inspect the fuel cable from end to end for
damage such as cuts, breaks, squashed or
trapped sections.
d) Check that the fuel filter is clean.
8. Fuel used or remaining seem inaccurate:
a) In rough seas, fuel may surge back and forth
through the fuel transducer, resulting in incorrect
readings. Try installing a one-way valve between
the fuel transducer and the fuel tank.
b) The Remaining fuel value must be reset after
every refuelling (see section 4-3 Fuel Setup).
c) The fuel tank may not refill to the same
capacity each time due to air pockets. This is
particularly noticable with underfloor tanks.
d) Fuel transducers wear out over time and should
be replaced after every 5000 litres of fuel.
9. A twin engine installation shows only one
flow rate:
a) Check that the number of engines is set to 2.
See section 4-3 Fuel Setup.
10. There is no reading for fuel economy:
a) The boat must be travelling through the water
to generate an Economy reading.
b) Check that the paddlewheel on the transducer
is spinning freely, and that the two magnets in
the paddlewheel are still in place.
FUEL 3100 Installation and Operation Manual