Refrigerant Leakage Detection (Ec) - Bosch Climate 5000 Series Service Manual

Service Manual

8.6 Refrigerant Leakage Detection (EC)

Error Code
Malfunction decision conditions
Supposed causes
Table 29
Troubleshooting:
Figure 44
Bosch Thermotechnology Corp. | 04.2020
EC
De ne the initial evaporator coil temperature T2 when the compressor just starts running as Tcool.
In the rst 5 minutes after the compressor starts up in cooling mode, if T2<Tcool -1.8ºF (1ºC) does not
keep continuous 4 seconds and this situation happens 3 times, the display area will show "EC" and the
unit will turn off.
Power off, then restart the
unit 2 minutes later.
Yes
Check cool air blowing out
from indoor air outlet
No
Check leakage of system
No
check blockIng of system and
clear the blocking
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 49
T2 sensor faulty
Indoor PCB faulty
System problems, such as leakage or blocking
Check if T2 sensor is
Yes
Replace indoor PCB.
Yes
Repair the leakage and
recharge the refrigerant
using the proper
equipment and process.
well fixed
Yes
Data subject to change