F.22 High
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Technical description: Safety switch off low water pressure
Typical repair cost: £0-160 (including labour)
DIY fix possible
Locate the filling loop valves underneath your boilerSlowly open both valves to let water into the systemClose both valves tightly once the pressure gauge reaches 1.5 bar
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
- Pressure sensor
- Expansion vessel
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