F.361 High

Viessmann F.361 Fault Code

Also written as F361 — same fault.

The Viessmann F.361 fault code means: your boiler is struggling to detect a flame when it tries to start, which means it cannot fire up to provide heating or hot water.. It appears on 4 Viessmann models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Flame signal not present or insufficient at burner start
Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas emergency control valve is in the 'on' positionIf you have a pre-payment meter, check that you have sufficient creditPress the 'Reset' button on the boiler control panel once

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like F.361: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Viessmann models that show the F.361 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Viessmann F.361 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026