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DIAGNOSIS AND SOLUTION (CONT)
Table 22—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-35.6°F(Tcool-2°C)
does not keep continuous 4 seconds and this situation happens 3 times, the display area
shows “EC” and AC turns off.
Supposed Causes
S T2 sensor faulty
S Indoor PCB faulty
S System problems, such as leakage or blocking
Troubleshooting:
Is cool air blowing from
the indoor air outlet?
Yes
Yes
Check the T2
sensor. Is it
securely attached?
No
Check system for leaks.
Are any leaks present?
No
Power off, then restart the
unit 2 minutes later. Does a
problem still remain?
Replace the indoor
PCB
Yes
Repair the leak and
recharge the refrigerant
Yes
Check system for blockages
and clear blockages if present
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