BoilerFaultCodesWhat the manual says
Manufacturer manualBurner in fault position. Internal fault. Replace the control unit.
From this model's manual
Verified against the Viessmann Vitodens 050 W Bpjd installation & service manual, page 52.
What causes this fault?
This fault occurs when the boiler's central processor can no longer communicate with the internal components or fails its own start-up safety checks. It is usually caused by an electrical component failure on the main circuit board or a surge that has damaged the delicate microchips that control the heating process.
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.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like F0: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.