Error Code Troubleshooting (Idu) - Bosch 15 SEER2 Series Installation Instructions Manual

Installation Instructions

13.11 Error Code Troubleshooting (IDU)

Number of fl ashes Description (Sensor)
4 Temperature sensor fault (T1)
5 Temperature sensor fault (T2)
Table 34
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 55
4 0 |
Handling
No
Reseat sensors
Yes
Replace sensors
Yes
Finish
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
Number of fl ashes Description (Sensor)
6 Communication error
Table 35
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 56
Handling
No
Correct the wire connections
Check if there is 230V
No
power input, if yes, replace
ODU board