Bosch Climate 5000 Series Service Manual page 46

Service Manual
7.6.3 Zero crossing detection error diagnosis and solution (EH 02)
Error Code
Malfunction decision conditions
Supposed causes
Table 23
Troubleshooting:
Check if the connections and
power supply are normal. The
power supply should not exceed
10% of the rated voltage.
Indoor main PCB is
defective. Replace indoor
Figure 40
Z ero crossing detection error is only valid for the unit with AC fan motor,
for other models, this error is invalid.
4 6 |
EH 02
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time
interval is abnormal.

Connection mistake

Indoor PCB faulty
Yes
main PCB.
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
Correct the connections. Turn on the
No
unit when the power supply is good.