Error Code Troubleshooting (Odu) - Bosch BRB-36HWD1N1-M18 Installation & Operation Manual

Installation & Operation Manual

13.10 Error Code Troubleshooting (ODU)

Error Code Description (Sensor)
P1 High pressure switch (HPS) protection
P5 Condenser coil temperature (T3) protection in cooling
P3 Compressor over current protection
Table 22
P1 (High pressure switch (HPS) protection)
Diagnosis
Check whether the high
pressure switch wires
are seated normally
Yes
Check whether high pressure
switch is closed
Yes
Check whether indoor and
outdoor units are normal by
filter and airflow
Yes
Cooling mode refers to P5
Figure 34
BTC 761701311 C | 04.2020
Handling
No
Reseat the wires according
to wiring diagram
No
Replace high pressure switch
No Exclude all fault reasons
and restart
Bosch Inverter Ducted Packaged Heat Pump 3 Ton | 29
P5 (Condenser coil temperature (T3) protection in cooling)
Diagnosis
Check whether T3 is normal
according to Table 34 (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
Check whether there is
normal throttle
Yes
Figure 35
Handling
No
Replace the T3 sensor
Replace the fan or
Yes
remove all the blockage
Yes
Do something to avoid air
return short circuit
No
Adjust refrigerant charge
No Adjust or repair the EEV
throttle
Data subject to change