Mars DVH Series - Page 40

Service Manual - DVH 09/12/18/24 SF Series
Service Manual - DVH 09/12/18/24 SF Series
40
42
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:
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 occur 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
2 minutes later. Is it
still displaying the error code?
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
Yes
Clear the blockage.
Yes
Is there any blockage? (Such as the
capillary or the welded points of the pipes.)