Bosch Climate 5000 Series Service Manual page 47

7.6.4 Fan speed has been out of control diagnosis & solution (EH 03 /EC 07)
Error Code
Malfunction decision conditions
Supposed causes
Table 24
Troubleshooting:
Power off, then restart the
unit 2 minutes later
Shut off the power supply,
Rotate the fan by hand.
Check the wiring of fan
Measure if the fan motor
voltage from the main PCB
is within normal parameters
Replace the DC motor driver
board & fan motor
Figure 41
F or certain models, outdoor PCB can not be removed separately. In this
case, the outdoor electric control box should be replaced as a whole.
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
EH 03 (indoor) / EC 07 (outdoor)
When indoor / outdoor fan speed is too low or too high for certain time, the unit will stop and the LED
will display the failure.

Wiring mistake

Indoor / Outdoor Fan assembly faulty

Indoor / Outdoor Fan motor faulty

Indoor / Outdoor PCB faulty
Yes
Yes
motor
Yes
Yes
No The unit operates normally.
Find out the cause and have
No
it solved
Correct the connections.
No
No Replace the main PCB
No
Service Manual
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