S.41 Emergency
Your boiler has detected that the water pressure inside the system is too high, which could cause leaks or damage if not reduced.
Technical description: Water pressure greater than 2.9 bar
Typical repair cost: £80-220 (including labour)
DIY fix possible
Locate a radiator bleed valve and use a key to release water into a cloth or container.Monitor the boiler pressure gauge until it drops back into the green zone (typically 1.2 to 1.5 bar).Ensure the silver braided filling loop valves are fully closed and not accidentally left open.
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.41 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop valve
- Expansion vessel
- Pressure relief valve (PRV)
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