National Luna Trailboss Series Fridge Manual
National Luna Trailboss Series Fridge Manual
Page 15
Page 14
RUN -
This indicator will be illuminated whenever the fridge compressor is running
and the compartment is being cooled.
FAULT ID -
This indicator is used to identify fault conditions that may occur with the
refrigerator such as low power supply.
This indicator will flash a pre-determined number of times every 4-seconds
when a particular fault occurs (see table below).
1
Low voltage. This is shown when the DC supply voltage is low. The battery could be
flat, wiring losses are too high or there is a poor connection to the power source.
2
Fan over-current cut-out. There is a problem with the ventilation fan. It is possible that
the ventilation fan is damaged.
3
Motor start error. The compressor has not started successfully. This can happen in
extreme environments where the refrigerator is heavily loaded & temperature is very high.
4
Minimum speed error. The motor cannot maintain a minimum speed of 1900 rpm.
This can be the result of an internal electronics failure.
5
Thermal cut-out. The electronic circuitry has over-heated. This happens in very hot
environments. This can occur when the fridge is over-loaded with warm contents and
the ambient temperature is high. The electronics will re-set when the temperature
has dropped.
6
Electronic Compressor Driver hardware failure.
NUMBER OF FLASHES
FAULT DESCRIPTION
Indicator Lights
Trouble Shooting
HIGH
MED
LOW
SPEED CONTROL
THE FRIDGE WILL AUTOMATICALLY CUT-OUT AT THE
SELECTED BATTERY PROTECTION LEVEL.
LOW WILL ALLOW THE BATTERY TO BE COMPLETELY DRAINED.
PRESS THE TURBO BUTTON TO OVER-RIDE
AUTOMATIC SPEED CONTROL
THE FRIDGE AUTOMATICALLY SELECTS VARIOUS SPEEDS TO
MAINTAIN THE DESIRED TEMPERATURE.
TURBO
BATTERY PROTECTION
DOWN
UP
“SET MODE” - PRESS
DOWN
FOR 3 SECONDS
TEMPERATURE
STATUS INDICATORS
RUN
FAULT ID
Power ON / OFF
(HOLD FOR 3 SECONDS)
DOWN
UP
“SET MODE” - PRESS
DOWN
FOR 3 SECONDS
TEMPERATURE
Power ON / OFF
(HOLD FOR 3 SECONDS)
MAXIMUM POWER WILL BE USED IN TURBO MODE
SPEED CONTROL
PRESS THE TURBO BUTTON TO OVER-RIDE
AUTOMATIC SPEED CONTROL
THE FRIDGE AUTOMATICALLY SELECTS VARIOUS SPEEDS TO
MAINTAIN THE DESIRED TEMPERATURE.
TURBO
MAXIMUM POWER WILL BE USED IN TURBO MODE
11.5V
10.5V
9.5V
HIGH
MED
LOW
THE FRIDGE WILL AUTOMATICALLY CUT-OUT AT THE
SELECTED BATTERY PROTECTION LEVEL.
LOW WILL ALLOW THE BATTERY TO BE COMPLETELY DRAINED.
BATTERY PROTECTION
11.5V
10.5V
9.5V
PROBLEM
POSSIBLE CAUSE
REMEDIAL ACTION
The fridge will not run
when connected to 12V,
but only when connected
to 230V mains.
12 Volt polarity reversed.
The battery is discharged.
The DC supply has inadequate
wiring, causing voltage loss.
(See page 9)
Fridge is initially connected to a
battery that is not fully charged.
Check polarity to battery is correct.
Recharge the battery.
Ensure all connections are secure.
Ensure supply has 4mm2 wire or
thicker and that the vehicle’s body is
not used as an earth.
Select “Low” on battery protection
(See page 10 and 11)
Fault ID light flashes once
every 4 seconds.
The ventilation fan is
noisy or not running.
The ventilation fan is blocked or
damaged.
There is excessive dust or dirt
build-up on the fan.
Fan damaged.
Check the ventilation fan for
obstructions.
Ensure sufficient space is allowed
around the ventilation area. (page 7)
If the fan is broken, return the
refrigerator to an authorised agent
for repair (page 17).
The Fault ID light is
flashing twice every
4 seconds.
The Fault ID light is flashing 3
times every 4 seconds.
The compressor failed to start
correctly.
High pressure due to over-load
or Electronic Compressor Driver
failure.
Under high pressure conditions this
fault will rectify itself automatically
when gas pressures equalise.
Continuous 3-flash conditions may
require Electronic Compressor
Driver replacement by an authorised
service agent. (Page 16)
The Fault ID light is
flashing 4 times every
4 seconds.
The compressor is not maintain-
ing the correct minimum speed.
Continuous 4-flash conditions may
require Electronic Compressor
Driver replacement by an authorised
service agent.
The Fault ID light is flashing
5 times every 4 seconds.
Compressor area is over-heated.
The cooling fan is in-operative.
Ambient temperature very high.
Fridge over-loaded.
Check fan. Check for inadequate
ventilation (See page 7)
Wait for ambient temperature to
drop. (See page 17)
The Fault ID light is flashing
6 times every 4 seconds.
Electronic Compressor Driver
failure (controller detects
abnormal parameters.)
Replace NL25-C3 Compressor
Driver (see page 16)
The thermostat display is
showing “ Prf “
The internal temperature probe is
faulty, damaged or disconnected.
Contact a National Luna service
agent for a probe replacement.
In abnormally high temperature conditions, the compressor may switch off for one minute
and then attempt to restart. It will continue to do so until temperature conditions improve.
In the event of unusual or undesired operation, consult the table below before contacting a service agent.
Trouble Shooting
Status indicators will identify the
current operation of the refrigerator.
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