Midea AURORA ONOFF Series User Manual

 Troubleshooting 20 
7.5 EC/EL 0C (Refrigerant leakage detection diagnosis and solution)
Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool.
In the beginning 5 minutes after the compressor starts up, if T2 < Tcool-2°C does not keep continuous 4 seconds and
this situation happens 3 times,the LED displays the failure code and AC turns off.
Recommended parts to prepare:
• T2 sensor
• Compressor
• Capacitor of compressor
• Indoor PCB
• System problems, such as leakage or blockages
• Capacitor of fan motor
• Outdoor fan
Troubleshooting and repair:
Power off
, then restart the unit 2 minutes later.
Power off, then restart the unit 2 minutes later.
Are any leakages present?
Are any leakages present?
Check System for blockages and clear
blockages if present.
Check System for blockages and clear
blockages if present.
Does a problem remain?
Does a problem remain?
Put your hands in front of the
indoor air outlet.
Put your hands in front of the
indoor air outlet.
YES
Is there cool air blowing
out from indoor air outlet?
Is there cool air blowing
out from indoor air outlet?
Is it securely
attached?
Is it securely
attached?
NO
Check the T2 sensor.
Check the T2 sensor
.
YES
Check system for leakages.
Check system for leakages.
NO
NO
Repair the leakage and
recharge the refrigerant.
Repair the leakage and
recharge the refrigerant.
YES
NO
The compressor is operating
constantly
The compressor is operating
constantly
The compressor does not
operate
The compressor does not
operate
Does a problem remain?
Does a problem remain?
Replace the compressor
Replace the compressor
Replace the capacitor of
compressor
Replace the capacitor of
compressor
NO
NO
NO
The compressor operates
several minutes then ceases
The compressor operates
several minutes then ceases
Does a problem remain?
Does a problem remain?
Replace the outdoor fan
Replace the outdoor fan
Replace the capacitor of fan
motor
Replace the capacitor of fan
motor
NO
NO
NO
Replace indoor PCB
Replace indoor PCB
Is it within acceptable
parameters?
Is it within acceptable
parameters?
Measure the resistance value
of the sensor.
Measure the resistance value
of the sensor.
Replace the sensor.
Replace the sensor.NO
YES
YES
Reinsert the T2 sensor
Reinsert the T2 sensor

Midea AURORA ONOFF Series Specifications

General

Brand	Midea
Model	AURORA ONOFF Series
Category	Air Conditioner
Language	English