This troubleshooting guide is written with
the assumption that the user has read and
understood the relevant sections in this
It is possible in many cases to solve difficulties
without having to send the display 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 display unit is reassembled
correctly and is waterproof. Users who service
the product themselves will void the warranty.
Repairs to the product may only be carried out
by a service centre approved by Navman. If the
product must be sent into a service centre for
repair, it is essential to send in the transducer(s)
at the same time.
More information can be found on our Website:
1. The fishfinder won’t turn on:
a) The FISH 4432/4433 is designed to operate
on a 12 volt battery system, where the
voltage may vary from 10 to 16 volts. If an
excessive voltage is supplied, the unit will
turn off/not start.
b) Check that the power cable connector
at the back of the display unit is securely
plugged in and the collar is locked in place.
Appendix C - Troubleshooting
The collar must be secure for watertight
c) Measure the battery voltage while the
battery is under load - turn on some
lights, radio or other electrical equipment
connected to the battery. If the voltage is
less than 10 volts:
- the battery terminals or wiring on the
terminals may be corroded.
- the battery may not be charging
correctly or may need replacing.
d) Inspect the power cable from end to end
for damage such as cuts, breaks, squashed
or trapped sections.
e) Ensure that the red wire is connected to the
positive battery terminal and the black wire
to the negative battery terminal. If wired for
the Auto Power option, ensure the yellow
wire is connected to the ignition circuit.
Also check the boat’s main switch circuit
(see section 6-5 Wiring options).
f) Check for corrosion on the power cable
connector and clean or replace if required.
g) Check fuses that are placed in line with the
power cable. A fuse can be blown despite
appearing to be good or the fuse may be
corroded. Test the fuse or replace it with a
fuse known to be good.
Appendix B - Dimensions
FISH 4432/4433 Installation and Operation Manual35 NAVMAN