Vaillant showing F.29 in Wednesbury? The flame lit and then went out while running. What can cause it, what you can check, and what needs an engineer.
If the meter ran out or the gas was turned off while the boiler was running, it will show F.29. Restore the supply and reset once.
On a hard frost, the condensate pipe can block while the boiler runs. Warm water along the outside section usually clears it.
Only when the shower and heating run together? Only in the morning? A clear pattern shortens the engineer's visit.
Gas pressure under full load, the flame sensor, the burner and the flue. The fix is usually a clean or one part.
No, it means the flame went out and the boiler stopped the gas. A smell of gas is the emergency: get out and call 0800 111 999.
Something changed after lighting: the gas pressure, the flame signal or the flue. That is why the timing matters.
If it was a one-off supply blip, yes. If it keeps coming back, it needs looking at.
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