5
Error Codes and Trouble Shooting
Digital Display
Fault Description
Fault Troubleshooting
E2
Current Protection
Check to see if pressure is too
high and if the fan is running
E3
Stall Protection
Low battery or too much
pressure
E4/LU
Undervoltage protection
The battery is too low and
needs to be charged
E6
Condensation fan failure
Short circuit of motor, poor
contact of plug
E7
Motor phase lost
Compressor terminals burnt
out or compressor short
circuit
E9/PER
Pressure switch protection
Pressure switch may be
damaged and needs
replacement
OPE
Open temperature sensor
Check is plug disconnected or
the wire is broken or
damaged
LU
Low voltage
SHr
Temperature sensor short circuit
Replacement of temperature
sensor
AC
Cooling failure
Check if system refrigerant is
low or the compressor
electronic fan has stopped
CS
Defrost
Defrost necessary