York YHKE09XEEAMH-RX Service Manual page 41

9.2.4 Refrigerant Leakage Detection diagnosis and solution(EC)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Shut off the power supply and
2 minutes
turn it on
still displaying the error code?
Is there cool air blowing
out from indoor air outlet?
Is there any leakage? Especially
the connection parts, such as the
gas valve and the liquid valve.
Is there any block i n g ? (Such as the
capillary or the welded points of the pipes.)
Clear the blocking.
EC
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℃ does not keep continuous 4 seconds and this
situation happens 3 times, the display area will show "EC" and
AC will turn off.
T2 sensor faulty
●
Indoor PCB faulty
●
System problems, such as leakage or blocking.
●
later. Is it
Yes
No
No
Yes
Check if T2 sensor is well
fixed. Correct the installation
Yes
or replace T2 sensor. Does
the problem remain again?
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant.
39
Yes