Dometic CoolAir RT 780 Operating Manual page 18

Display messages
8.2 Control panel fault messages
The "Fault" LED (fig. 2 2, page 3) lights up if there is a fault with the parking cooler.
The type of error is shown on the display by the following error codes:
Display
Description
text
FO1 The compressor does not
work.
FO2 The system cannot
determine the current
temperature.
FO3 System overload, the
compressor switches off.
FO4 –
FO5 Overload due to fan.
FO6 Communication problem
between display unit and
control unit.
18
Cause
Compressor overload or
fault in the electricity supply
to the compressor.
Room temperature sensor is
not correctly connected to
the parking cooler or the
measured value is not within
the specifications.
Thermal overload due to a
defective fan or an ambient
temperature that is too
high.
Short circuit in condenser
fan or evaporator fan.
Fault in the wiring.
CoolAir RT780
Remedy
➤ Switch off the system.
➤ Switch it on again after
60 minutes.
➤ If the fault occurs again,
contact an authorised
workshop.
➤ Do not operate the system
at ambient temperatures
of below 0 °C or above
43 °C.
Leave the system switched off
and consult an authorised
service centre.
EN