F.22 High
Your boiler has stopped working because the water pressure is too low for it to operate safely.
Technical description: There is insufficient water in your system.
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the silver braided filling loop hoses underneath or near your boilerSlowly open the one or two small taps on the filling loop to allow water into the systemMonitor the pressure gauge until it reaches between 1.0 and 1.5 bar, then close the taps tightly
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.22 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop valve
- Pressure sensor
- Expansion vessel
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