Revision Date – 15/07/2020
page 10
TROUBLESHOOTING
6.2 DC Power Supply
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge does not run when
using a 12/24V DC power
supply.
12/24V DC plug fuse has
blown.
Replace 12/24V DC plug fuse (refer to
Fault with 12/24V DC fridge
power lead.
Check continuity of lead from plug to
socket. Replace lead if faulty or damaged.
Poor connection of plug to
socket in back of fridge.
Check that plug is correctly installed into
socket in back of fridge.
NOTE: A poor connection can cause
high resistance and a large
voltage drop. This can cause
the battery protection system to
activate prematurely.
No power to supply socket
from power source (eg
vehicle battery).
Check that vehicle wiring is correct and
that power is available at the outlet socket.
The DC supply voltage is
below the minimum voltage
needed to operate the fridge.
Connect the fridge to a 12 or 24V DC
power supply. Check the supply voltage.
NOTE: The compressor control unit
and digital display will not
operate if the supply voltage is
below approximately 7V DC.
The polarity of the fridge
power circuit is wired
incorrectly.
This means the positive (+)
and negative (-) wires are
connected back to front.
Check the DC wiring circuit to ensure the
polarity (“+” and “–“) is correct.
NOTE: The compressor control unit has
inbuilt polarity protection and
will not function if the polarity is
incorrect.
Poor electrical connection
inside the fridge between the
power socket and the
compressor control unit.
Check connections between the DC socket
and the “+” and “-” terminals on the
compressor control unit.
Check that approximately 12 or 24V DC is
measured at the “+” and “-“ terminals.
