COMFORT-AIRE A-SVH09SA-0, Service Manual

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Service Manual - SVH 09/12/18/24 Series
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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 8 minutes after the compressor starts up, if T2
＜
Tcool
－
1
℃
(
Tcool
－
33.8
°F)
d oes not remain continuous for 4
seconds and compressor running frequency higher than 50Hz
does not
remain continuous 3 minutes, and this situation
happens 3 times.
3 times, the d isplay area will
Possible causes
●
T2 sensor faulty
●
Indoor PCB faulty
●
System problems, such as leakage or block age .
Troubleshooting:
Is there cool air blowing
out from indoor air outlet?
Yes
Yes
Check if T2 sensor is well
connected . Correct the instal -
lation or replace T2 sensor.
Does the problem remain?
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 block age
Yes
Is there any block age ? (Such as the
capillary or the welded points of the pipes.)