BoilerFaultCodesWhat the manual says
Manufacturer manualFan error – tachometer signal interrupted for 1 hour or longer
What causes this fault?
This fault occurs when the boiler's control board loses track of how fast the fan is spinning, meaning it can no longer safely manage the flow of air and exhaust gases. The most common reason is a mechanical failure within the fan motor or a loose electrical connection that prevents the speed signal from reaching the main computer. In some cases, a fault on the control board itself means it can no longer 'hear' the fan, even if the fan is spinning correctly.
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 A05: no call-out fees, no surprise bills.
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Related fault codes
All 25 fault codes on the Modena HE
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