Heat Controller B-DVH18SD-1 - Refrigerant Leakage Detection (EC)

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Heat Controller DVC/DVH Inverter Mini-Split
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10.3.6 Refrigerant Leakage Detection Diagnosis and Solution (EC)
Error Code
EC
Malfunction In the first 5 minutes that the compressor starts up, if the temperatures
do not remain a constant function where T2 < (Tcool – 2)
for 4 seconds
and occurs 3 times, the display will show error code “EC” and unit will
turn off.
T2 is the Indoor Coil Temperature Sensor
Tcool is the temp when the compressor first begins to run.
Possible Causes ● T2 Sensor faulty
● Indoor PCB Faulty
● Refrigeration Circuit problems, such as gas leakage or blockages.
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 block ing? (Such as the
capillary or the welded points of the pipes.)
Repair the leak and recharge the
systemwithrefrigerant.
Check if T2 sensor is connected
well.Correcttheconnectionor
replace T2 sensor. Does the
problemhappenagain?
Clear the blockage or replace blocked
component,suchascapillarytubes.
Isthereanyblockage?(Suchasthecapillary
ortheweldedjointsofthepipes.)
Istherearefrigerantleak?
Check at the connection joints of the
gas and liquid valve.