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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.14 EO Error (Abnormal Operation: Outdoor Temperature Sensor)
Error Description
Outdoor Temperature Sensor Error Error is displayed when the ambient sensor has short-circuited or is disconnected
Checkpoint
Chec
k if the outdoor temperature sensor wire is connected correctly.
1. Control board wire
2. Outdoor temperature sensor wire
Measure and check the resistance of the outdoor temperature sensor wire (NTC method).
Check the outdoor temperature sensor for disconnection
Check the outdoor temperature sensor for short-circuit
Table 34
Figure 54
Check the assembly
condition of the control board
and the temperature sensor wire
Reassemble the control board
and the temperature sensor wire
Replace the temperature
sensor
Replace the temperature
sensor
Replace the control board
Check the
temperature
sensor for short
Is the
resistance of the
temperature sensor
normal?
Ye s
Ye s
No
No