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Boiler over pressure on the hot-water side?

My vaillant boiler dial is in the red on the hot water side

Paul Marriott
October 2022
VaillantBathroom Appliances, Baths and ShowersBoiler Hotwater Vaillant
Bleed a radiator or use one of the drain covks and run a hose outside.
Check the filling loop is properly shut off
If it's a combi boiler you may have a heat exchanger with a leak between the mains pressure incoming water and the primary circuit.
Think about getting a maintenance contract with callout and spares coverage. I think Vailla t do quite a good one.

Vhu6
October 2022

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