Carrier 38MAQB09-1 - Refrigerant Leakage Detection Diagnosis and Solution

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DIAGNOSIS AND SOLUTION (CONT)
Refrigerant Leakage Detection diagnosis and solution (EC)
Error Code EC
Malfunction decision conditions
Define the evaporator coil temp.T2 of the compressor. It starts running in Tcool. At first, 5 minutes
after the compressor starts up, if T2 ＜Tcool－35.6_F (Tcool－2 _C) does not run for 4 seconds
and this situation occurs 3 times, the display area displays“EC”and the air conditioner turns off.
Supposed causes
·T2 sensor faulty
·Indoor PCB faulty
·System problems, such as leakage or blocking.
Troubleshooting
Check cool air blowing out
from indoor air outlet
Yes
Yes
No
Check for system leaks
No
Power off, then restart the
unit 2 minutes later.
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
Yes
Check for system blocking and
clear the block
Check the T2 sensor