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

Installation & Operation Manual

13.11 Error Code Troubleshooting (IDU)

Number of fl ashes Description (Sensor)
4 Temperature sensor fault (T1)
5 Temperature sensor fault (T2)
Table 32
4/5 Flashes (Temperature sensor fault)
Diagnosis
Check whether T1/T2 sensor
is seated normally
Yes
Unplug the sensor and
measure the resistance to
ensure it's neither 0 nor ∞
No
Restart the unit to check if
the problem is resolved
No
Replace indoor control board
Figure 52
BTC 761701311 C | 04.2020
Handling
No
Reseat sensors
Yes
Replace sensors
Yes
Finish
Bosch Inverter Ducted Packaged Heat Pump 3 Ton | 35
Number of fl ashes Description (Sensor)
6 Communication error
Table 33
6 Flashes (Communication error)
Diagnosis
Check if the communication
wire is connected properly
(Refer to Figure 32 and 33)
Yes
Check if ODU control board
LED display is working
Yes
Restart the system
Figure 53
Handling
No
Correct the wire connections
Check if there is 230V
No
power input, if yes, replace
ODU board
Data subject to change