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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.15 E1 Error (Abnormal Operation: Exhaust Temperature Sensor)
Error Description
Hot Water Thermistor_T3 Error Error is displayed when the Exhaust Thermistor has short-circuited or is disconnected
Checkpoint
Chec
k if the Exhaust Thermistor connector is connected normally.
1. Control board wire
2. E xhaust Thermistor wire
Measure the check the resistance of the Exhaust Thermistor (NTC method).
— Separate the sensor and measure it at room temperature.
Check the Exhaust Thermistor for disconnection
Check the Exhaust Thermistor for short-circuit
Table 35
Figure 59
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?
Ye s
Ye s
No
No
86 °F: 7.05 kΩ (± error possible)
140 °F: 2.5 kΩ
185 °F: 1.2 kΩ
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