Vaillant service and fault code posts

Posts on Vaillant display codes, fault causes and the authorised service process.

  • Water running from a bathroom mixer tap with a wall-mounted combi boiler in the background

    Vaillant service

    Combi Boiler Not Giving Hot Water: Causes and Fixes

    Boiler running but no hot water at the tap? Based on the troubleshooting tables in Vaillant's manuals, we walk through likely causes, safe checks you can do yourself and when to call a technician.

  • Gloved finger pressing the control panel of a white condensing combi boiler

    Vaillant service

    How to Reset a Vaillant Boiler: Steps for Each ecoTEC Model

    Vaillant boiler locked out and you want to reset it? Based on the ecoTEC plus, pure, pro and intro user manuals, here is how the reset button works, how many attempts are allowed and when you shouldn't reset at all.

  • Checking the ignition electrode and gas valve inside a Vaillant boiler

    Vaillant service

    Vaillant Boiler F.28 Error: Causes and Fix

    Seeing F.28 on your Vaillant boiler? Here is what the official manual says it means, safe checks you can run yourself, and when to call a licensed technician.

  • Checking the circulation pump and pressure gauge of a combi boiler

    Vaillant service

    Why Does a Vaillant Boiler Show F.75, and How Is It Fixed?

    F.75 on a Vaillant boiler points to a pump or low-water fault. Here are the likely causes, what you can safely check, and when to call a licensed technician.

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