York HP Series Service Manual page 101

16.4.5 Refrigerant Leakage Detection diagnosis and solution (EC)
Error Code
Malfunction conditions
Potential Causes
Trouble shooting:
EC
Define the evaporator coil temperature T2 of the compressor
starts running as Tcool.
If the following occurs 3 times, the display shows "EC" and the
unit switches off:
In the first 8 minutes after the compressor starts up, if T2 ＜
Tcool－2℃ is not maintained for 4 seconds and compressor
running frequency is not higher than 50Hz for 3 minutes
Faulty T2 sensor
●
Faulty indoor PCB
●
System problems, such as leakage or blockages
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