Bosch Climate 5000 Series Service Manual page 58

5 8 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units
8.6.10 Current overload protection (P3)
Error Code
Malfunction decision conditions
Supposed causes
Table 29
Troubleshooting:
- 27K Regular & 18K Hyper Heat models: 18.5A
- 36K Regular & 27K Hyper Heat models: 22.5A
Figure 66
Data subject to change
P3
If the outdoor current exceeds the current limit value, the LED will display the failure.
Current protection of compressor
Current protection of compressor
Check whether the input current
of power supply wire is more than
- 18K Regular model: 15A
- 48K Regular & 36K Hyper Heat models: 28A
Yes
Check whether the
Check whether the
refrigerant system
refrigerant system
is ok
is ok
Check whether the
Check whether the
outdoor ambient temperature
outdoor ambient temperature
is higher than 50
is higher than 50
No
Check whether the
Check whether the
outdoor unit has
proper ven la on and clearance.
No
Check whether the
Check whether the
heat exchanger is dirty
heat exchanger is dirty
No
Check if there any leakage
with refrigerant pipe
No
Replace outdoor PCB
and check whether the
and check whether the
system can run normally
system can run normally
No
Replace the electric control box
Replace the electric control box
Improper / Incorrect Wiring
Over load protector faulty
System blockage
Outdoor PCB faulty
No Replace outdoor main board
Replace outdoor main board
Yes Stop the system
Make sure the outdoor unit has
Yes
proper ven la on and clearance
Yes Clean the heat exchanger
Clean the heat exchanger
Extract the refrigerant, then use the high pressure
, then use the high pressure
Yes nitrogen or refrigerant to blow pipe, vacuumize
nitrogen or refrigerant to blow pipe, vacuumize
and charge the refrigerant again
and charge the refrigerant again
Yes
Yes Problem is solved
Service Manual
08.2020 | Bosch Thermotechnology Corp.