Heatline NTC Sensor 0020126681

The Heatline 0020126681 is an NTC sensor (thermistor) used in Heatline gas boilers. It provides a temperature-dependent resistance signal to the boiler's control board so the appliance can monitor and regulate water temperature. This sensor is listed for the Capriz Plus and Monza appliance families.

• Boiler locks out or fails to fire, with a fault code pointing to a temperature sensor circuit.
• Domestic hot water temperature is erratic, cycling hot and cold without a change in demand.
• Central heating flow temperature reads inaccurately against a thermometer at the flow pipe.
• Boiler short-cycles or modulates poorly because the control board is receiving a faulty temperature signal.
• Resistance reading at the sensor is outside the expected range for the ambient or water temperature.

• Confirm the boiler model and GC number match one of the appliances listed above.
• Check the fault code or diagnostics before replacing, as sensor circuit faults can also originate at the wiring or control board.
• Inspect the sensor connector and lead for corrosion, moisture ingress or damage before fitting a new sensor.
• Compare the part number on the existing sensor with 0020126681.