BoilerFaultCodesYour boiler has detected an electrical problem with the system that controls the gas flow, meaning it cannot light safely for heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Gas–valve control – defective | Cause: Short circuit/earth (ground) leak in cable loom 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 central computer loses the ability to safely communicate with the gas valve. The most common reason is an internal electrical failure within the valve's coils or a malfunction on the main control board, which prevents the system from regulating fuel flow. In some cases, it can also be triggered by damaged internal wiring that has developed a short circuit.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 F.61 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vaillant Ecomax 613 2 E 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.
Affiliate links — we may earn a commission at no extra cost to you.