Bosch ODU Split 6 - Error Code 21: DC PEAK (IPM Fault)

Error handling instructions for Split outdoor unit
Split ODU – 6 720 817 722 (2015/06)
4
2.3 Error code 21
Fig. 1 Resistance measurement on compressor
[1] Compressor
[2] Copper pipe
5664, 5665 48 Cond. Out-pipe Th Error (Open/
Short)
Direct shut-down Sensor TH6 broken (5k >25 °C)
5632, 5633 52 Bad communication between
Inverter-PCB and Main-PCB
Restart 3x/hour,
then blocked
Wiring between Mainboard and Inverter board
damaged (3~ phase only)
5634, 5635 53 Bad communication between Can-
PCB and Main-PCB
Direct shut-down Wiring between Mainboard and CAN-PCB
damaged
5636, 5637 54 Phase sequence incorrect Restart 10x/hour,
then blocked
only 2 phases or incorrect rotation field
(3~ phase only)
5668, 5669 55 CAN Communication error (CAN-
PCB <=> Installerboard)
Direct shut-down Wiring between CAN-PCB and Indoor unit
damaged
5638, 5639 60 EEPROM Checksum mismatched Direct shut-down Change EEPROM
5640, 5641 61 Temperature at condenser-pipe is
too high
Restart after
problem has
vanished
Condensing temperature >65.3°C (4199 kPa)
{Heating}
Condensing temperature >64.2
°C(4101 kPa)
{Cooling}
5642, 5643 62 Temperature at heat sink is too
high
Restart after
problem has
vanished
Heat sink temperature >85 °C
5646, 5647 65 Problem in heatsink temperature
sensor
Direct shut-down Heat sink sensor / Inverter-PCB broken
5670, 5671 67 ODU BLDC fan lock Restart 10x/hour,
then blocked
Fan blocked
HMI Error code ODU Error code Description Error characteristc Remark
Table 3 Error codes
When the outdoor unit (ODU) is blocked the error can be
acknowledged by power ON/OFF.
Display
code
Title Cause of error
Check point & Normal
condition
21 DC PEAK
(IPM fault)
-Instant over
current
-Over rated
current
-Poor insulation
of IPM
-An instant over current in
the U,V,W phase
-Comp lock
-The abnormal connection of
U,V,W
-Over load condition
-Overcharging of refrigerant
pipe length
-Outdoor fan has stopped
-Poor insulation of
compressor
Table 4 Error code 21
ODU model Resistance () at 25 °C
ODU Split 4
ODU Split 6
ODU Split 8
U-V
0.628
V-W
0.628
W-U
0.628
ODU Split 11s
ODU Split 13s
ODU Split 15s
U-V
0.438
V-W
0.438
W-U
0.438
ODU Split 11t
ODU Split 13t
ODU Split 15t
U-V
0.845
V-W
0.845
W-U
0.845
Table 5 Resistance between phases
V
U
W
6 720 817 722-01.1I
1
2
1