Bosch Climate 5000 Series Service Manual page 41

Service Manual
8.6.2 Indoor / outdoor communication error (E2)
Error Code
Malfunction decision conditions
Supposed causes
Table 20
Troubleshooting:
Communication malfunction between indoor and
Start: Power off , then Power on the
A/C by the Breaker (reconnect the
power wire). Is it still displaying the
indoor terminal following
the wiring diagram. Are all
check if the error code is
the indoor units. Is IPM
power LED or operating LED
correct? Check on the outdoor
check point.(2 for two zones,
3 for three zones, 4 for four zones
Replace outdoor unit PCB assembly
Figure 41
Bosch Thermotechnology Corp. | 08.2020
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units | 41
E2
Indoor unit does not receive the feedback from outdoor unit for 120 seconds or outdoor unit does not
receive the feedback from any one indoor unit for 180 seconds.
outdoor units
error code?
Yes
Check wiring
on the outdoor and
No
connec ons correct?
Yes
Turn on all
the indoor units and
No
shown on all indoor
units' display.
Yes Yes
Turn off all
No
lamp On?
Yes
Is main board
No
lamp on?
Yes
Are
indoor units number
and 5 for five zones)
No first time No second time
(include wiring)
Incorrect installation of indoor to outdoor control wire
Electromagnetic interference
Indoor or outdoor PCB faulty
Reconnect the wiring
Reconnect the wiring
Measure
Vs, is it moving
alternately between positive value
and negative value? (Vs is the
voltage between S and L2).
Yes
Replace IPM
Is the reactor connected
No Reconnect the wiring
properly?
Yes
Replace Outdoor Main PCB
A
No
A:
Is all the wiring
No
between terminal and
Indoor PCB ok?
Yes
Change the Indoor PCB
Power
with remote
controller. Is it s ll
displaying error code
a er 3 minutes?
No
Problem is solved
No
Data subject to change