How to test multiple boiler issues quickly. Heatinggeeks. Boiler repair. Vokera 01 339 Comments / Uncategorized / By daveadmin https://youtube.com/watch?v=M_K9foxlVp0 On this Vokera I show you how I set up multiple test so I can quickly Isolate the issue. The boiler may only go to fault once during my visit so I don't want to miss it. Check out my Vokera Playlist.