Midea Mono 3D, Service Manual

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9.3.6 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
－
2
°C(Tcool
－
35.6
°F) does not keep continuous 4
seconds and this situation happens 3 times, the display area will
show “EC” and AC will turn off.
Supposed causes
●
T2 sensor faulty
●
Indoor PCB faulty
●
System problems, such as leakage or blocking.
Trouble shooting:
Is there cool air blowing out from
indoor air outlet?
Yes
Yes
Check if T2 sensor is well fixed. Correct
the installation or replace T2 sensor. Does
the problem remain again?
No
Is there any leakage? Especially
the connection parts, such as the
gas valve and the liquid valve.
No
Shut off the power supply and turn it on
5 seconds later. Is it still displaying the
error code?
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
Yes
Clear the blocking.
Yes
Is there any blocking? (Such as the
capillary or the welded points of the
pipes.)