Alpha Boiler NTC Thermistor Temperature Sensor with Washer 1.021762

Product Overview

The Alpha Boiler NTC Thermistor Temperature Sensor with Washer (Part Number: 1.021762) is a replacement temperature-sensing component intended for selected Alpha heating systems.

The NTC (Negative Temperature Coefficient) thermistor forms part of the boiler's temperature monitoring system. Its electrical resistance decreases as temperature increases, allowing the boiler's electronic controls to monitor temperature during operation.

The sensor is described as being supplied with a washer, which is associated with its installation and sealing arrangement.

Accurate temperature sensing is important for maintaining appropriate boiler temperature control and reliable operation.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished components should be professionally inspected and tested to confirm correct temperature-sensing performance before installation.

Technical Insight & Common Failure Symptoms

The NTC thermistor is a temperature-sensitive electrical component that provides temperature information to the boiler's Printed Circuit Board (PCB).

As the sensor's temperature changes, its electrical resistance changes accordingly. The boiler's control system interprets this information to monitor temperature and support normal operation.

A faulty sensor or associated electrical connection may provide incorrect temperature feedback, affecting the boiler's heating or hot water performance.

Possible symptoms that may indicate an NTC thermistor or associated component problem include:

• Boiler failing to maintain the required water temperature.

• Incorrect or inconsistent temperature readings.

• Fluctuating heating or domestic hot water temperatures.

• Boiler failing to respond correctly to temperature changes.

• Intermittent boiler operation.

• Unexpected boiler shutdowns or lockouts.

• Temperature sensor-related fault indications.

• Visible damage or deterioration affecting the sensor or its connections.

These symptoms do not necessarily confirm a faulty thermistor, as similar problems may result from wiring, electrical connections, circulation issues or other boiler components. Correct professional diagnosis should be carried out before replacement.

Compatibility

This part (MPN: 1.021762) is associated with selected Alpha boiler systems.

Please verify the exact boiler model, original part number, sensor specifications and sealing arrangement against the manufacturer's technical documentation before ordering to ensure correct fitment.

Safety Advice

Boiler temperature sensors and associated electrical and hydraulic components should only be inspected, removed or installed by a suitably qualified and competent heating engineer.

Always isolate the appliance's electrical supply and allow the heating system to cool before carrying out any work. Where sensor replacement involves opening the hydraulic circuit, the system must be safely isolated and depressurised. Follow the manufacturer's servicing instructions and complete all required electrical, leakage and operational safety checks before returning the boiler to service.