Leaking Worcester Greenstar Flow Sensor/ Adaptor. Heating geeks boiler repair 2,178 Comments / Uncategorized / By daveadmin https://youtube.com/watch?v=MatDkEkS0Mw A quick repair on a Worcester Greenstar. Most engineers will have got this wrong the first time!! I know I did. Turn up with a flow sensor and leave with your tail between your legs.