Vaillant showing F.75 in Wednesbury? The boiler did not detect a pressure change when the pump started. Easy checks first, then the parts an engineer looks at.
With the system cold, check the gauge or the pressure shown on the display. If it is low, use the filling loop as the manual describes, then reset once.
Gurgling pipes or radiators that need bleeding often come with F.75. Bleeding them lowers the pressure, so top up again afterwards.
A pump that has sat still can stick. If F.75 appears after the boiler has been off for a while, mention that to the engineer.
Pump running and speed, the pressure sensor reading, and the expansion vessel charge. Usually a single part.
No, the boiler will not run until it is happy with the water side. If you smell gas at any point, leave the house and phone 0800 111 999.
The pressure is leaking away. Look for drips at radiator valves and the outside pipe, and have the vessel checked.
Ask to see their Gas Safe ID card. The reverse lists the work they are qualified to do.
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