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Vaillant F57 Fault Code

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.

F.57 Meaning

According to the installation and servicing instructions manual, “Fault during comfort safety mode”.

Cause of F57

According to the installation and servicing instructions manual. The Ignition electrode is highly corroded


We suggest taking out the ignition electrode to inspect it without opening up the main heat exchanger. The steps for this is to first turn of the boiler. Remove the front panel. Unplug the ignition cable from the ignition electrode including the earth connector. Undo the two screws either side. Remove the electrode assembley. Inspect the electrode and replace as necessary. Please note you will require a new gasket if the existing electrode is fine or it will be included with the new electrode.

Part Nos

Vaillant Electrode 090709
Vaillant Electrode 090709

Vaillant Electrode 090709

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