Bosch BOVA Series - System Error Code Troubleshooting

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Bosch IDS BOVA Installation Instructions
12.2016 | Bosch Thermotechnology Corp.Data subject to change
15.10 Error code troubleshooting
Error Code Description
P1 High pressure switch(HPS)protection
P5 Condenser coil temperature(T3) protection in cooling
Hb High pressure(PT) protection in Heating
P3 Compressor over current protection
Table 14
P1 (High pressure switch(HPS)protection)
Diagnosis
Handling
Check whether the service
valves are open
Yes
Check whether the switch
wires is seated normally
Yes
Check whether high pressure
switch is close
Yes
Check whether indoor and
outdoor units are normal by
valve, filter and airflow
Open the service valve
No
Reseat the wires according
to wiring diagram
No
Replace high pressure switch
No
Exclude all fault reasons
and restart
No
Yes
Cooling mode refers to P5
Heating mode refers to Hb
Figure 45
P5 ( Condenser coil temperature(T3) protection in cooling)
Diagnosis
Handling
Check whether the service
valves are open
Yes
Check whether T3 is normal
according to Table 1(between
temperature and resistance)
Yes
Check whether outdoor unit
motor is abnormal or whether
the outdoor condenser coil is
blocked
No
Check whether there is short
circuit in air outlet and inlet side
No
Check whether the charge is
correct by subcooling
according to installation guide
in charge mode when cooling
Yes
Yes
Check whether there is normal
of throttle
Open the service valves
No
Replace the T3 sensor
No
Replace the fan or
remove all the barriers
Do something to avoid air
return short circuit
Yes
Adjust refrigerant charge
No
Yes
Adjust or repair the TXV
throttle
No
Figure 46