BoilerFaultCodesTechnical description
Gas–valve control defective. Short circuit/earth (ground) leak in cable harness to gas valves, gas valve assembly defective (earth/ground leak from coils), electronic control system defective
What causes this fault?
This fault occurs when the boiler's main computer loses the ability to communicate with or operate the gas valve safely. The most common reason is an electronic failure within the printed circuit board (PCB) or a direct mechanical failure of the gas valve itself, preventing the boiler from controlling the flame.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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