Ec (Refrigerant Leakage Detection Diagnosis And Solution) - Bosch CLIMATE 5000 Service Manual

5.5.8

EC (Refrigerant Leakage Detection diagnosis and solution)

Description: Define the evaporator coil temp.T2 of the compressor just starts running as Tcool.
Within first 8 minutes after compressor start, it will be measured that the condition T2<Tcool - 1K is kept at least for 4 seconds and the running
frequency is more than 50Hz for 3 minutes. If it is not the case and this occurs 3 times, "EC" failure will be shown on the display. The unit will turn off.
Possible defects:
• Faulty T2 sensor
• Faulty indoor PCB
• System problems, such as leakage or blockages
Troubleshooting and repair:
Power off, then restart the unit 2 minutes later.
Does a problem remain?
Put your hands in front of the indoor
Is there cool air blowing out
from indoor air outlet?
Check system for leakages.
Are any leakages present?
Check System for blockages and clear
blockages if present.
CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08)
YES
air outlet.
NO
NO
NO
YES Check the T2 sensor.
Is it securely attached?
Repair the leakage and recharge the
YES
refrigerant.
Troubleshooting
Replace the indoor
YES
PCB
51