E1 (Indoor And Outdoor Unit Communication Error) - Bosch CLIMATE 5000 Service Manual

5.5.3

E1 (Indoor and outdoor unit communication error)

Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times.
Possible defects:
• Faulty indoor PCB
• Faulty outdoor PCB
• Faulty reactor
Troubleshooting and repair:
Measure Vs. (Vs is the voltage between S and N of outdoor
The voltage moves alternately with positive value.
Replace the
reactor
CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08)
Power off, then restart the unit after 2 minutes.
Does a problem remain?
YES
unit. Red pan-S, Black pan-N)
Is the voltage moving alternately
between positive and negative?
NO
Check the outdoor wiring connection
Is it normal?
YES
Check the reactor.
NO Is it normal?
YES
Replace the outdoor PCB.
Power on.
Is the error
resolved?
NO
Replace the indoor PCB.
The unit is operating normally
NO
The voltage is a certain value
NO
Check the indoor wiring connections
Is it normal?
YES
Replace the indoor PCB.
Power on.
Is the error resolved?
NO
Replace the outdoor PCB.
Troubleshooting
45