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 two blue-handled taps or a braided hose) underneath the boiler.Slowly open both taps until you hear water flowing and the needle on the pressure gauge reaches 1.5 bar (the green zone).Close both taps tightly and press the 'Reset' button on the boiler control panel.
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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