BoilerFaultCodesYour boiler has stopped working because it cannot correctly detect if the internal fan is spinning at the right speed to safely clear away exhaust fumes.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan tacho signal fault
What causes this fault?
This fault occurs when the boiler's main computer loses track of how fast the internal fan is spinning, which is a vital safety check. It is typically caused by a buildup of dust and debris slowing the motor down, or a failure in the electronic sensor that reports the speed back to the system. If the fan can't be verified as working correctly, the boiler shuts down to prevent dangerous exhaust gases from staying inside the unit.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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