Vaillant ecoTEC showing F22 in Coventry? It means low water pressure, sometimes called dry fire. How to check and top up safely.
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F22 on a Vaillant ecoTEC means there is not enough water pressure in the system. Vaillant describe it as a dry fire protection. The boiler stops to avoid heating without enough water.
Check the pressure gauge, top up with the filling loop as your manual shows, and reset. If the pressure keeps falling, the leak is the job worth doing.
Many ecoTEC boilers in Coventry sit in newer homes with fitted kitchens. The boiler is boxed in, so a small drip can run for weeks before anyone sees it. The gauge is often the first warning.
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.
They compare the gauge with the vessel pressure, then inspect the valves, the pipework and the relief pipe. Boxed-in boilers take longer to inspect, so allow a little more time.
A photo of the gauge and one of the boiler with the cupboard open. Tell us how often it drops and whether you have bled the radiators lately.
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. A boiler that needs topping up monthly has a fault that will not fix itself.
The source of the loss. A recharged vessel is quick. A buried joint takes longer. The engineer finds the source first and explains the job before starting.
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