P3 Troubleshooting - Bosch IDS 2.0 Service Manual

Service Manual

12.3.12 P3 Troubleshooting

LED display output:
Description:
Possible causes:
Table 40
Procedure:
Figure 27
1) See Section 13.1
2) See Section 13.5
3) See Section 13.8
Bosch Thermotechnology Corp. | 07.2021
P3
Compressor over current protection
 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
Yes
Are you running in
force mode?
No
Check for abnormal
pressure1
Yes
No
Is there still a fault
code?
Yes
Yes
Is the system
overcharged?
No
Yes
Did the high
pressure switch
fail? 2
No
Yes
Did the compressor
fail? 3
No
Restart system
Yes
Is ambient
temperature >
120F?
No
No service required
Follow IOM to adjust
refrigerant
Replace HPS
Replace compressor
Bosch IDS 2.0 | 53
Quit force mode
Data subject to change