TROUBLE SHOOTING
HKD DCI 53 Version - 2
11.2.5 Refrigerant Leakage Detection diagnosis and solution (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
＜Tcool－2℃ does not keep continuous 4 seconds and this
situation happens 3 times, the display area will show “EC” and
AC will turn off.
● T2 sensor faulty
● Indoor PCB faulty
● System problems, such as leakage or blocking.
Check cool air blowing out
from indoor air outlet
Yes
Yes
Check if T2 sensor
is well fixed
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
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