Carrier 40MBFAQ Service Manual page 22

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EL 0C (Refrigerant Leakage Detection Diagnosis and Solution)
Description: Define the evaporator coil temperature T2 of the compressor which starts running as Tcool. After unit start up and
five minutes after the compressor starts up, if T2 < Tcool-1°C(1.8°F) does not maintain for 4 seconds and the compressor
running frequency (higher than 50Hz) does not maintain for 3 minutes, and this situation occurs 3 times, the display area
displays "EL 0C" and air conditioner unit turns off.
Recommended parts to prepare:
• T2 sensor
• Indoor PCB
• Additional refrigerant
Troubleshooting
Power off, then restart the unit 2 minutes later.
Does a problem remain?
Put your hands in front of the
Check system for leaks.
Are any leaks present?
Check the system for blocks and
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
YES
indoor air outlet.
Is there cool air
air blowing out from
indoor air outlet?
NO
NO
NO
clear blocks if any.
Check the T2 sensor.
YES
Is it
securely attached?
Repair the leak and
YES
recharge the refrigerant.
22
Replace the
YES
indoor PCB.