Worcester Bosch Temperature Sensor 87145000540

The Worcester Bosch 87145000540 is a temperature sensor that forms part of the control and monitoring circuit on Worcester Bosch Greenstar appliances. It reads the temperature of the water at its mounting point and passes that signal to the boiler's control board, which uses it to regulate firing and to protect the appliance from overheating or unsafe running conditions. It is listed under the thermostats, thermistors and sensors group of Worcester spare parts.

• The boiler locks out or fails to fire, with a fault code relating to temperature sensing or an open or short circuit sensor.
• Domestic hot water temperature is erratic, running hot then cold, or does not match the setting on the control.
• Central heating output is unstable, with the boiler cycling more often than normal.
• The appliance shuts down shortly after ignition and restarts once it has cooled.
• Intermittent faults that clear when the boiler is left to stand, then return once it is running again.

• Check the GC number on the appliance data badge against the compatibility list to confirm the sensor is correct for your model.
• Confirm the part number on the existing sensor matches 87145000540 or the alternative number 1013027 before ordering.
• Inspect the sensor mounting point 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.