F1 High
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Technical description: Low water pressure
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop (usually a silver braided hose with small valves) underneath the boiler.Slowly open both taps until you hear water flowing and watch the pressure gauge.Close both taps tightly once the needle reaches between 1 and 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F1 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop
- Expansion vessel
- Pressure relief valve
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