Carrier 38QHC009D8S Series, Service Manual

Page: 44 / 55

42
10.2.4 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
＜
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.
Supposed causes
●
T2 sensor faulty
●
Indoor PCB faulty
●
System problems, such as leakage or blocking.
Trouble shooting:
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