Service Manual -
VMH 9/12/18/24 SU & VMH30/36S D Series
33
36
9.3.6 Refrigerant Leakage Detection diagnosis and solution
(EC)
Error Code
EC
Malfunction 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.
Possible
causes
●
T2 sensor faulty
●
Indoor PCB faulty
●
System problems, such as leakage or blocking.
Troubleshooting:
Check if T2 sensor is well
connected. Correct the
installation or replace T2 sensor.
Does the problem remain again?
Is there any refrigerant leakage?
Especially the joints, such as the
gas valve and the liquid valve.
Repair the leak and
recharge the refrigerant.
Is there any blockage? (Such as the
capillary or the welded points of the pipes.)
Clear the blockage.