u/Complete-Ad4764

I'm new to this but when we've taken off the caps water is pouring out.

Do I need to bleed the downstairs radiators to stop this? Just moved into a property that has a Vitodens 100 combi boiler.

Can't afford to pay for a refit so looking to see how I can do it myself. I just need the water to stop coming out of these pipes while I reattach the radiator.