How much does it cost to fix Vaillant error code F.82?

Typical repair cost for the Vaillant F.82 fault is £150-250 including labour.

F.82 Medium

Vaillant F.82 Fault Code

Q: What does the Vaillant F.82 fault code mean?

Your boiler has detected a communication issue with the safety component that prevents internal corrosion, meaning it cannot confirm the tank is protected.

Also written as F82 — same fault.

The Vaillant F.82 fault code means: your boiler has detected a communication issue with the safety component that prevents internal corrosion, meaning it cannot confirm the tank is protected.. It appears on 1 Vaillant model in our database.

Technical description: Fault:Ext.currentanode Externalcurrentanodenotconnected: – X43edgeconnectorwithbridgemissingfromthePCB Externalcurrentanodeconnected: – Powersupplytotheexternalcurrentanodewasinterrupted – CablebetweenPCBandexternalcurrentanodedefective – Externalcurrentanodedefective

Typical repair cost £150-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vaillant models that show the F.82 fault code

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

ecoTEC exclusive Repair: £150-250

Source

Vaillant F.82 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026