Vaillant ecoTEC showing F22 in Coventry? It means low water pressure, sometimes called dry fire. How to check and top up safely.
Cold, around one bar is typical - your manual gives the exact figure for your model.
Open the filling loop gradually and close it fully at the right reading. Then reset the boiler.
Running with too little water can damage the heat exchanger, so the boiler protects itself. The code is the safety system working.
A weeping radiator valve, a joint under the floor, or an expansion vessel that has lost its charge. Trace it once rather than refilling forever.
No, it is the boiler preventing damage to itself. Smell gas? Leave the house, do not use switches, and call the National Gas Emergency line on 0800 111 999. A fault code is never a gas leak, but a smell always is.
That is expected - bleeding lets water out. One top-up should clear it.
Rarely. More than a couple of times a year means water is escaping somewhere.
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