BoilerFaultCodesWhat the manual says
Manufacturer manualFault F22 will be stored in the fault list if the water pressure falls below 0.03 MPa (0.3 bar).
What causes this fault?
This fault occurs when the water level inside your central heating system drops too low for the boiler to function safely. The most common reason is a slow leak from a radiator valve or a pipe joint, but it can also happen if you have recently bled your radiators without topping the water back up.
This fault is frequent in autumn when homeowners turn their heating back on for the first time and discover pressure has dropped over the summer months.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like F22: no call-out fees, no surprise bills.
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