Main Pcb - Bosch BMS500-AAU009-0AHXXA Service Manual

Service Manual
8.3.3 Zero crossing detection error diagnosis and solution (E2)
Error Code
Malfunction decision conditions
Supposed causes
Table 16
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 24
Bosch Thermotechnology Corp. | 02.2018
E2
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time
interval is abnormal.
Connection mistake
PCB faulty
Yes

main PCB.

Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 31
Correct the connections. Turn on the
No
unit when the power supply is good.
Data subject to change