Heat Controller B-DVH09SD-0 Service Manual page 41

Heat Controller
10.3.6 Refrigerant Leakage Detection Diagnosis and Solution (EC)
Error Code
Malfunction
Possible Causes
Trouble shooting:
Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?
Is there cool air blowing
out from indoor air outlet?
Is there any leakage? Especially
Is there a refrigerant leak?
the connection parts, such as the
Check at the connection joints of the
gas valve and the liquid valve.
gas and liquid valve.
Is there any block i n g ? (Such as the
Is there any blockage? (Such as the capillary
capillary or the welded points of the pipes.) or the welded joints of the pipes.)
Clear the blockage or replace blocked
Clear the blocking.
component, such as capillary tubes.
EC
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.
T2 Sensor faulty
●
Indoor PCB Faulty
●
Refrigeration Circuit problems, such as gas leakage or blockages.
●
Yes
No
Yes
No
Yes
Check if T2 sensor is well
Check if T2 sensor is connected
fixed. Correct the installation
well. Correct the connection or
Yes
or replace T2 sensor. Does
replace T2 sensor. Does the
problem happen again?
the problem remain again?
Yes
Replace indoor PCB.
Repair the leakage and
Repair the leak and recharge the
recharge the refrigerant.
system with refrigerant.
41
DVC/DVH Inverter Mini-Split