BoilerFaultCodesWhat the manual says
Manufacturer manualDry fire. Too little water in the appliance, water pressure sensor defective, cable to pump or water sensor defective, pump blocked or defective, pump output too low
What causes this fault?
This fault occurs when the internal pressure sensor detects that there isn't enough water in the system to circulate heat safely. The most common reasons are a slow leak hidden somewhere in your pipework or radiators, or the need to bleed air out of the system after a period of heavy use.
This fault is frequently seen in autumn when homeowners turn their heating back on for the first time, as small leaks or air pockets often develop while the system sits idle over summer.
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 F.22: no call-out fees, no surprise bills.
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