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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.17 E3 Error (Abnormal Operation: Return Sensor)
Error Description
Return Sensor Error Error is displayed when the Return sensor has short-circuited or is disconnected
Checkpoint
Chec
k if the Hot Water Thermistor connector is connected normally.
1. Control board wire
2. Return sensor wire
Measure the check the resistance of the Return sensor (NTC method).
— Separate the sensor and measure it at room temperature.
Check the Return sensor for disconnection
Check the Return sensor for short-circuit
Table 37
Figure 71
Check the assembly
condition of the control board
and the temperature sensor
connector and reassemble
the control board and the
temperature sensor connector
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?
No
Ye s
Yes
No
86 °F: 40 kΩ (± error possible)
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
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