23
Refrigerant Leakage Detection diagnosis and solution (EC)
Error Code EC
Malfunction decision conditions
Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the
beginning 5 minutes after the compressor starts up, if T2 35 Tcool 35_F does not keep
continuous 4 seconds and this situation happens 3 times, the display area will show “EC”
and AC will turn off.
Supposed causes
S T2 Sensor faulty
S Indoor FCB faulty
S System problems, such as leakage or blocking
Check cool air blowing out
from indoor air outlet
Yes
Yes
Check if T2 sensor
No
Check leakage of system
No
Power off, then restart the
unit 2 minutes later.
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
Yes
check blockIng of system and
clear the blocking
Fig. 30 – Troubleshooting
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