P2/H5 Troubleshooting - Bosch IDS 2.0 Service Manual

5 2 | Bosch IDS 2.0

12.3.11 P2/H5 Troubleshooting

LED display output:
Description:
Possible causes:
Table 39
Procedure:
Figure 26
1) See Section 13.1
2) See Section 13.2
Data subject to change
P2/H5
Low pressure protection
 Poor heat exchange on coil (cooling mode – indoor coil, heating mode – outdoor coil)
 Fan motor failure (cooling mode – indoor fan, heating mode – outdoor fan)
 Service valves not open
 TXV/EEV/filter drier blocked
 Under charged
P2 error code
Yes
P2 occurs 5 times in
100 minutes
No
Yes
Is there still a fault
code displayed?
Check for abnormal
pressure1
No service required
No
Is there still low
pressure?
Yes
Yes
Is the system
undercharged?
No
Yes
Did the pressure
transducer fail?2
No
Restart system
H5 displayed, hard lockout System hard shut down
Power on unit
No
Follow IOM to adjust
refrigerant
Replace PT
Service Manual
07.2021 | Bosch Thermotechnology Corp.