Service Manual Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 37
Bosch Thermotechnology Corp. | 02.2018
Data subject to change
8.3.6 Refrigerant Leakage Detection diagnosis and solution(EC)
Error Code EC
Malfunction decision conditions
Defi ne the initial evaporator coil temperature T2 when the compressor just starts running as Tcool.
In the fi rst 5 minutes after the compressor starts up in cooling mode, if T2<Tcool-2℃ (Tcool - 35.6℃)
does not keep continuous 4 seconds and this situation happens 3 times, the display area will show "EC"
and the unit will turn off .
Supposed causes
f T2 sensor faulty
f Indoor PCB faulty
f System problems, such as leakage or blocking.
Table 21
Troubleshooting:
Figure 34
Check cool air blowing out
from indoor air outlet
Yes
Yes
Check if T2 sensor is
well fixed
No
Check leakage of system
No
Power off, then restart the
unit 2 minutes later.
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant
using the proper
equipment and process.
Yes
check blockIng of system and
clear the blocking
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