Ok I’ll start from the top: 1. Noticed my heating wasn’t coming on tonight when I got home from work, 2. Went to boiler and noticed the low pressure light blinking and pressure gauge at 0, 3. No big deal I say to myself, I’ll just refill the loop and bleed all the radiators, 4. Turn the blue knob underneath that’s on the flexible pipe and let the gauge read 1.5 bar, turn off the blue knob again and turn on the boiler again, 5. Sit and watch the boiler for a few seconds it gets up to 1.8 bar so I start working my way round all the radiators and bleed them till it’s just water one after each other from closest to boiler to the furthest, 6. Go back to the boiler and it’s at 3 bar! So I immediately turned it off and went to the nearest radiator and undone the bleeder valve to let the system drain into a bucket and reduce pressure, 7. Go back to the boiler and see the PRESSURE IS STILL RISING, 8. I put buckets under every radiator in the house and keep bleeding for about 20 minutes but the pressure isn’t going down, 9. My neighbour comes to my door to tell me there’s water spraying from my house, 10. I go outside and see a 10mm pipe that was protruding from my wall with an stop end cap on it has burst in the wall of the pipe and it is spraying water everywhere, 11. I go back inside and turn on every tap, eventually get enough flow that the pressure on boiler reads close to zero so I run out and use duct tape to close the burst pipe as best I can, 12. I go back inside turn off all taps, close all radiators except the one closest but now the pressure is at 3.4 bar and is static. I have no clue what on earth is going on. The filler loop is closed at both vales: the blue handle on flexible pipe is closed position and I used a screwdriver to close the ball valve that’s underneath and is where the cold loop connects into the combi boiler. does anyone have any clue what is going on?