Bosch AHUW036A2 Service Manual page 6

Error handling instructions for Split outdoor unit
3
Fig. 4 ODU Split 11s, 13s, 15s
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.
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. 5 PFC_IPM check
6
1
2
U V W
6 720 817 722-04.1I
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
Split ODU – 6 720 817 722 (2015/06)