Worcester Bosch Temperature Sensor Greenstar 87145000490

The Worcester Bosch 87145000490 is a temperature sensor used on Worcester Bosch Greenstar appliances. It reads the temperature at its mounting point and feeds that signal back to the boiler's control board, which uses it to regulate heating and hot water operation. A working sensor keeps the boiler modulating correctly; a failed one can cause erratic running, lockouts or inaccurate hot water temperatures.

• Boiler locks out or fails to fire, with a temperature-related fault indicated on the controls
• Hot water temperature is inconsistent, running hot then cold without a change at the tap
• Heating output fluctuates or the boiler short-cycles more than usual
• Central heating flow temperature reads noticeably higher or lower than the actual system temperature
• Intermittent faults that clear after the boiler is reset, then return

• Confirm the appliance model and, where available, the GC number against the compatibility list before ordering
• Check the part number on the existing sensor and compare it with 87145000490 and alternative number 1013025
• Inspect any seal, O-ring or retaining clip on removal and replace it if it is perished or damaged
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.