BoilerFaultCodesYour boiler has stopped working because it isn't receiving enough gas to safely stay lit.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Burner blocked, gas supply pressure too low
What causes this fault?
This fault occurs when the boiler's internal sensor detects that the gas flow is insufficient to maintain a stable flame. The most common reasons are a blockage within the gas valve or an issue with the external regulator that controls the pressure entering your home.
This fault is more frequent during extreme cold spells, as high demand on the local gas network can cause external supply pressures to drop below the boiler's required minimum.
DIY fix possible
Check if other gas appliances, like a cooker, are working correctlyIf you have a prepayment meter, check that you have sufficient creditCheck that the main gas lever/cock near the meter is pointing in the direction of the pipe (fully open)
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like A0 — no call-out fees, no surprises.
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Viessmann Vitodens 100 Compact is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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