Worcester Bosch NTC Sensor Right Angled 87186843230

The Worcester Bosch 87186843230 is a right-angled NTC (negative temperature coefficient) sensor used across the Greenstar appliance family. It sits in the temperature-sensing circuit and changes resistance as the sensed temperature rises, giving the control board the readings it needs to regulate heating and hot water. The right-angled body suits the mounting position on these appliances, where a straight sensor would foul the surrounding components.

• The boiler locks out or fails to fire, with a temperature-related fault code shown on the display
• Domestic hot water runs hot and cold instead of holding a steady temperature
• The heating circuit overshoots the setpoint or short-cycles as the board reacts to a drifting reading
• Resistance measured across the sensor falls outside the expected range for the ambient or water temperature at the time of testing
• Intermittent faults that clear on reset and return once the appliance reaches operating temperature

• Check the GC number and appliance serial plate against the compatibility list to confirm the sensor suits your model
• Confirm the alternative number 1030869 matches the part currently fitted before ordering
• Inspect the sensor pocket and any sealing washer or O-ring at the same time, as these are often disturbed during removal
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.