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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
13.11 Error Code Troubleshooting (IDU)
Number of fl ashes Description (Sensor)
4 Temperature sensor fault (T1)
5 Temperature sensor fault (T2)
Table 32
Figure 52
4/5 Flashes (Temperature sensor fault)
Diagnosis
Handling
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
Reseat sensors
No
Yes
Finish
Yes
No
Replace indoor control board
Replace sensors
Number of fl ashes Description (Sensor)
6 Communication error
Table 33
Figure 53
6 Flashes (Communication error)
Diagnosis
Handling
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
Correct the wire connections
No
No
Check if there is 230V
power input, if yes, replace
ODU board
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