Bosch AHUW036A2 Service Manual page 7

ODU Split 11t, 13t, 15t
Fig. 6 ODU Split 11t, 13t, 15t
1. Wait until PCB (Inverter) DC voltage is discharged after main power
is shut off.
2. Pull out V, W, U COMP connector.
3. Set multi tester to resistance mode.
4. If the value between P and N terminal of IPM is short (0) or open
(hundreds M), PCB (Inverter) needs to be replaced, IPM is
damaged.
5. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB (Inverter)
needs to be replaced. PCB (Inverter) is damaged.
Split ODU – 6 720 817 722 (2015/06)
Error handling instructions for Split outdoor unit
PFC_IPM check
U, V, W ' R S T
P W V U
27 26 25 24
P W V U
27 26 25 24
Fig. 7 PFC_IPM check
6 720 817 722-05.1I
Nw Nv Nu
23 22 21
0.4 ~ 0.6 V
Nw Nv Nu
23 22 21
0.4 ~ 0.6 V
6 720 817 722-03.1I
7