F.87 Medium

Viessmann F.87 Fault Code

Also written as F87 — same fault.

The Viessmann F.87 fault code means: your boiler has stopped working because the water pressure inside the heating system is currently too high.. It appears on 1 Viessmann model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Burner in a fault state. Water pressure too high.
Typical repair cost £80-150 (including labour)

DIY fix possible

Locate a radiator with a bleed valve and place a cloth underneathOpen the valve slightly using a radiator key to let water out until the pressure gauge on the boiler drops into the green zone (usually 1.0 to 1.5 bar)Close the valve and check the boiler display to see if the error code clears

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Viessmann models that show the F.87 fault code

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

Source

Viessmann F.87 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