Bosch IDS 2.0 - P3 Troubleshooting

Service Manual Bosch IDS 2.0 | 53
Bosch Thermotechnology Corp. | 07.2021
Data subject to change
12.3.12 P3 Troubleshooting
LED display output: P3
Description: Compressor over current protection
Possible causes:
 Poor heat exchange on coil (cooling mode – outdoor coil, heating mode – indoor coil)
 Fan motor failure (cooling mode – outdoor fan, heating mode – indoor fan)
 Service valves not open
 TXV/EEV/filter drier blocked
 Over charged
 Control board or compressor issue
Table 40
Procedure:
Figure 27
Are you running in
force mode?
Ye s
Ye s
Is there still a fault
code?
Is ambient
temperature >
120F?
No
Ye s
Quit force mode
No
Ye s
Is the system
overcharged?
Ye s
Follow IOM to adjust
refrigerant
No
Did the high
pressure switch
fail? 
Ye s
Replace HPS
No
Restart system
Check for abnormal
pressure
Did the compressor
fail? 
No
Ye s
Replace compressor
No
No service required
1) See Section 13.1
2) See Section 13.5
3) See Section 13.8