Worcester Bosch Thermostat 900mm Capillary 87161423920

The Worcester Bosch 87161423920 is a manual reset thermostat supplied with a 900mm capillary. It monitors temperature at the sensing point and interrupts the appliance's control circuit once the set limit is reached, helping the appliance run safely and efficiently.

The manual reset design means the thermostat must be reset by hand after it trips, rather than re-engaging automatically. It is used across a number of Worcester Bosch appliance families, including the Boilerhouse and Danesmoor ranges.

• The appliance fails to reach or hold its set temperature.
• The thermostat trips repeatedly and needs frequent manual resets.
• Overheating, kettling or a lockout that clears only after the reset button is pressed.
• The capillary tube is kinked, crushed, corroded or otherwise damaged along its run.
• No change in appliance behaviour when the sensing point is heated or cooled.

• Check the model and serial plate on the appliance against the compatibility list below.
• Confirm the capillary length and reset type of the thermostat already fitted match this part.
• Check whether a gasket or seal is needed at the sensing pocket before refitting.
• Isolate the appliance and let it cool before removing the sensing phial.