Indoor / Outdoor Unit's Communication (E1) - Bosch Climate 5000 Series Service Manual

4 2 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit

8.2 Indoor / outdoor unit's communication (E1)

Applicable models:
Wall Mounted IDU System: 9K ~ 36K
Cassette IDU System: 9K ~ 24K
Ducted IDU System: 9K ~ 24K
Error Code
Malfunction decision conditions
Supposed causes
Table 23
Troubleshooting:
Replace the reactor
Replace the reactor
Figure 33
Data subject to change
E1
Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition
happens four times continuously.
Incorrect installation of indoor to outdoor control wire
Electromagnetic interference
Indoor or outdoor PCB faulty
Power off, then restart the unit 2 minutes later.
Power off f f , then restart the unit 2 minutes later.
Is the error extinguished?
Is the error extinguished?
No
Measure Vs. Is the voltage moving
Measure Vs. Is the voltage moving
alternately between -25VDC to 25VDC?
alternately between -25
Yes
Check the outdoor wiring connection
Check the outdoor wiring connection。
Is the wiring correct ?
Is the wiring correct ?
Yes
Check whether reactor
C heck whether reactor
No
is normal?
is normal?
Yes
Replace the outdoor main PCB.
Replace the outdoor main PCB.
Power on. Is the error
Power on. Is the error
extinguished?
extinguished?
No
Replace the indoor main PCB.
Replace the indoor main PCB.
25V ?
Check the indoor wiring connection
Check the indoor wiring connection。
Is the wiring correct ?
Is the wiring correct ?
Replace the indoor main PCB.
Replace the indoor main PCB.
Power on. Is the error
Power on. Is the error
Replace the outdoor main PCB.
Replace the outdoor main PCB.
Service Manual
No
Yes
extinguished?
extinguished?
No
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