Worcester Bosch Flow Sensor 8716122562

Restore reliable hot water performance and ignition on Greenstar/CDi boilers. This OEM flow sensor (turbine + Hall sensor) detects DHW flow so the boiler fires and modulates correctly. It is the latest replacement for earlier codes 87161157540 and 87161072230.

Why this part

• OEM accuracy: Factory-calibrated sensor delivers a clean signal to the PCB for stable temperature control.
• Complete kit: Supplied with O-rings and stainless clips (contents vary by batch).
• Direct fit: Push-fit designno pipework changes required.

Typical compatibility*

Used across many Greenstar CDi / CDi Classic, i, Junior, Si and British Gasbadged Greenstar models (e.g., 2542 kW CDi Classic; Greenstar 25i/30i ErP; 24i/28i Junior; 532/537/542/i etc.). Always confirm by matching the exact part number in your boilers exploded diagram.

Common symptoms of failure

• No hot water unless taps are fully open
• Hot water temperature hunting or cutting out
• DHW/flow-related fault codes despite correct gas settings

Whats in the box

• 1 Flow sensor assembly Worcester 8716122562
• O-rings & retaining clips (as supplied)

Install & safety

Isolate power/water, depressurise, replace the sensor and seals, then verify DHW operation and check for leaks. Must be installed by a Gas Safe register