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It could be a leak in the heating system somewhere, rad valve or more likely, it is probably your pressure release valve. It only takes a small drip to loose pressure. Check outside the house near the boiler and you will see the pressure release outlet. It should not be dripping. Hope this...

Thanks Chris for your reply, we live in a detached house, and the mains water pressure is fine as the water from the cold water taps comes out extremely fast, so i don't believe the problem lies with the actual water supply, but rather with the boiler itself. Could you explain to me what the...

We have recently moved into a new house and have a problem with the domestic hot water. We have a vaillant combi boiler (do not know the exact model), central heating is fine and domestic hot water downstairs seems to be fine. The bath and shower upstairs sometimes fails to light the bioler. The...