GD Midea Refrigeration Equipment Elite Series Technical & Service Manual page 22

PROBLEM
Lack of refrigerant
Compressor Soft starter module failure
protection
Overcurrent protector
failure
Outdoor PCB failure
Open or short Temperature sensor
circuit of outdoor failure
Connector failure or loose Repair or replace the sensor.
temperature
Outdoor PCB failure
sensor
Temperature sensor
Room temp or
failure
evap temp sensor
Connector failure or loose Repair or replace the sensor.
open or short
Indoor PCB failure
circuit
Over load or too
Soft starter module failure
low voltage
protection
Power failure
Wiring failure
Fan speed
Indoor fan motor failure
beyond control
Indoor PCB failure
Zero-crossing
Indoor PCB failure
error
Air filter
Unit undersized
Condenser and
Evaporator
Room structure
Air flow
Sunlight
Outdoor fan motor
indoor fan motor
Insufficient
cooling or heating.
Less refrigerant
Capillary tube
Compressor
Heat sources
reverse valve
CAUSE
Check leakage. Recycle the refrigerant. Correct and
recharge if there is any leakage in the refrigerant system.
Check the module and the capacitor connected to the
module. Replace if failure.
Check the resistance of compressor overcurrent protector.
Replace if failure.
Replace after checked failure.
Replace after checked failure.
Replace after checked failure.
Replace after checked failure.
Replace after checked failure.
Check the module and the capacitor connected to the
module. Replace if failure.
Wait if checked the power voltage is really too low.
Correct if indoor fan motor wiring is loose.
Check the input of fan motor. Replace if failure.
Replace after checked failure.
Replace after checked failure.
Clean or replace if restricted.
Determine if the unit is properly sized for the area to be
cooled or heated.
Clean or replace if restricted.
Take proper measures to make the door and windows sealed
well if gap is found.
Clean or remove if any barrier is found to block the
inlet/outlet wind flow of the unit.
Add a awning if the outdoor unit is exposed to the sunlight.
Check the fan capacitor on outdoor power control board and
replace the board if not within +/-10% of manufacturer's
rating. Replace the motor if the speed is not within +/-10% of
manufacturer's rating but not because of the capacitor.
For electrical function 2.3 models. Check the fan capacitor in
indoor electric box (for some models, the capacitor is on
main PCB.) and replace the capacitor (or main PCB) if not
within +/-10% of manufacturer's rating.
Replace the motor if the speed is not within +/-10% of
manufacturer's rating but not because of the capacitor.
Check the tubes for reasons of leakage. Recycle the
refrigerant, correct the leakage points and recharge.
Regulate the flow if capillary tube is blocked. Make the
evaporating temperature appropriate if the evaporator is
frosted.
The inlet and outlet valve of the compressor is damaged,
making the low pressure connected with the high pressure.
The refrigerating system is difficult to produce high pressure
and low pressure. Replace the compressor after checking for
the reason.
Reduce if over loaded.
The two paths for refrigerant are connected, making the low
pressure connected with the high pressure. The refrigerating
system is difficult to produce high pressure and low pressure.
Replace the reverse valve after checking for the reason.
REMEDY
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