Carrier 40MAHB Series Service Manual page 25

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Refrigerant Leakage Detection (EL0C)
Description: Define the compressor's evaporator coil temperature (T2) starts running as Tcool.
In the initial 5 minutes after the compressor starts, if T2<Tcool-1.8
higher than 50Hz however it does not maintain for a minimum of three minutes and this issue occurs 3 times, the LED displays the failure code and the
unit turns off.
Recommended parts to repair:
• T2 Sensor
• Indoor PCB
• Additional refrigerant
Troubleshooting
Power off the unit. Restart the unit 2 minutes later.
Does a problem remain?
Place your hands in front of the
Check the system for leaks.
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 cool air
blowing from the
indoor air outlet?
NO
NO
Are there
any leaks?
NO
clear any if present.
 
F (1 C) is not maintained for 4 seconds and the compressor runs at a frequency is
YES Check the T2 sensor.
Is it securely
attached?
Repair the leak and
YES
recharge the refrigerant.
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Replace the
YES
indoor PCB.