Bosch AHUW036A2 Service Manual page 26

Error handling instructions for Split outdoor unit
ODU Split 11t, 13t, 15t
Check point
▶ Check the transmission connector and LED (main and inverter)
1
OK
2
3
Fig. 23 Error code 52 check point ODU Split 11t/13t/15t
[1] Insufficient insertion of wires
[2] Damage of wire coating: Interference with wires or wire coating
damage with chopping
[3] 42/48/60k
[4] Inverter PCB
[5] Main PCB
26
NG
4 5
6 720 817 722-21.1I
Split ODU – 6 720 817 722 (2015/06)