AC MGA0800/A1, User Manual

Page: 14 / 16

13
7.2 Faults and treatment
Item Possible reasons Fault handling
Temp. sensor
failures
The sensor has not been
connected correctly
Check the circuit connectors
，
and connect it again
The sensor is
damaged
Change the sensor
high Temperature
alarm
The condenser or evaporator is
dirty and blocked
Clean the condenser or evaporator
Refrigerating capacity isn’t
enough
Please consult usability professional
The temperature setting is fault Set the temperature again
Frequent high
system pressure
alarm
The condenser or evaporator is
dirty and blocked
Clean the condenser or evaporator
External fan is fault Change the fan
Condenser temperature sensor
wrongly sends alarm
Change the condenser temperature sensor
Evaporator
-frozen
alarm
Internal cycling path is blocked
Check if there are block to stick the internal
cycling path
Internal fan is fault Maintain or change it
Refrigerating system can’t stop
Check if the air-conditioner reaches the
refrigeration stop conditions but the actual status
doesn't stop, if yes, inform the AC maker to deal
with it.
Evaporator temperature sensor
wrongly sends alarm
Change the evaporator temperature sensor
Compressor can’t
run
There is no cooling demand Check if refrigeration is not needed
Within shutdown delay Check if compressor is protected
Compressor line has not been
connected correctly
Check the compressor line
，
and connect it again
Compressor protect switch or
motor is fault
Check if compressor protect switch is ok, and
change compressor protect switch if fault; if motor
is fault, change the compressor
Internal fan can’t
run
Internal fan is fault Change the fan
Internal fan line has not been
connected correctly
Check the Internal fan line
，
and connect it again
External fan is stuck
Check if there are block to stick the fan or not, and
clear the block