S.41 Emergency
Your boiler has too much water in the system, causing the pressure to rise to a level that is higher than recommended for safe operation.
Technical description: Water pressure > 2.8 bar
Typical repair cost: £80-160 (including labour)
DIY fix possible
Locate a radiator bleed valve and use a radiator key to slowly release water into a cloth or container.Monitor the pressure gauge on the boiler control panel until it drops back into the green zone (typically 1.0 to 1.5 bar).Ensure the internal or external filling loop valves are tightly closed to prevent more water from entering the system.
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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