Refrigerant Leakage Detection Diagnosis And Solution - Carrier 38MAQB12-1 Service Manual

DIAGNOSIS AND SOLUTION (CONT)
Refrigerant Leakage Detection diagnosis and solution (EC)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Power off, then restart the
Check cool air blowing out
from indoor air outlet
Check for system leaks
Check for system blocking and
clear the block
EC
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
and this situation occurs 3 times, the display area displays"EC"and the air conditioner turns off.
·T2 sensor faulty
·Indoor PCB faulty
·System problems, such as leakage or blocking.
unit 2 minutes later.
Yes
No
No
_
F (Tcool－2
Yes Check the T2 sensor
Yes
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
36
_
C) does not run for 4 seconds