BoilerFaultCodesTechnical description
Start fan speed
What causes this fault?
This fault occurs when the boiler's control system attempts to start the fan but detects that it isn't reaching the necessary speed to safely vent exhaust gases. The most common reason is a mechanical failure within the fan motor or a communication error where the main circuit board cannot correctly read the fan's rotation speed.
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.
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