SG-40MAHB-01: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
DIAGNOSIS AND SOLUTION (CONT)
Refrigerant Leakage Detection diagnosis and solution (EC)
Malfunction Decision Conditions
Define the compressor’s evaporator coil temp.T2. The unit starts running in Tcool. Five minutes after the compressor starts, if T2< Tcool-35.6F
(Tcool-2 C) does not run for 4 seconds and this situation occurs three times, the display area displays “EC” and the air conditioner turns off.
Possible Causes:
• System problems such as leaks or blockage
• T2Sensor faulty
• Indoor PCB faulty
Troubleshooting
Check cool air blowing out
from indoor air outlet.
Yes
Yes
No
Check for system leaks.
No
Power off, then restart the
unit 2 minutes later.
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
Yes
Check for system blocking and
clear the block.
Check the T2 sensor.
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