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Troubleshooting
Page 90
5.7 EC (Refrigerant Leakage Detection diagnosis and solution)
Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool.
In the beginning 8 minutes after the compressor starts up, if T2<Tcool-1°C (Tcool-33.8°F) does not keep continuous 4
seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation
happens 3 times, the display area will show “EC” and AC will turn off.
Recommended parts to prepare:
• Faulty T2 sensor
• Faulty indoor PCB
• System problems, such as leakage or blockages
Troubleshooting and repair:
Power off, then restart the unit 2 minutes later.
Are any leakages
present?
Check System for blockages and
clear blockages if present.
Does a problem remain?
Put your hands in front of the
indoor air outlet.
YES
Is there cool
air blowing out from
indoor air outlet?
Is it securely
attached?
Replace the
indoor PCB
YES
Check the T2 sensor.
YES
Check system for leakages.
NO
NO
Repair the leakage and
recharge the refrigerant.
YES
NO
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