Worcester Bosch Burner reset light red/orange inverted flash (2.5s on, 0.5s off) Fault Code: What It Means & How to Fix It

Your boiler has stopped working because the internal fan, which safely clears waste gases, is either not spinning or has been disconnected.

Typical repair cost for the Worcester Bosch Burner reset light red/orange inverted flash (2.5s on, 0.5s off) fault is £250-£450 including labour.

What the manual says

Manufacturer manual

Lockout: fan motor error — faulty or disconnected fan motor

From this model's manual

Verified against the Worcester Danesmoor Riello 535 installation & service manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like Burner reset light red/orange inverted flash (2.5s on, 0.5s off): no call-out fees, no surprise bills.

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