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