D.60 High

Vaillant D.60 Fault Code

Also written as D60 — same fault.

The Vaillant D.60 fault code means: your boiler is repeatedly shutting itself down as a safety precaution because it is becoming too hot.. It appears on 28 Vaillant 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: Number of safety temperature cut off

What causes the Vaillant D.60 fault?

This fault occurs when the boiler's internal safety sensors detect that the water temperature has risen too quickly or peaked beyond safe limits multiple times. It is usually caused by a lack of water flow, often due to a failing pump or a blockage of sludge and debris inside the main heating unit. Because the heat cannot be carried away into your radiators fast enough, the system shuts down to prevent the metal components from warping or cracking.

This issue often comes to light during the first cold spell of autumn, when a pump that has been idle all summer fails to start or struggles to push water through a cold, stagnant system.

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that your home's radiator valves are fully open to allow water to flowEnsure your thermostat and programmer are calling for heatCheck that the boiler pressure gauge is in the green zone (usually 1 to 1.5 bar)

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Vaillant models that show the D.60 fault code

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

Source

Vaillant D.60 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