E020 High

Vokera E020 Fault Code

The Vokera E020 fault code means: your boiler has shut down because it has reached an unsafe temperature, triggered by a safety sensor that prevents the unit from overheating.. It appears on 12 Vokera 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: Limit thermostat

What causes the Vokera E020 fault?

This fault occurs when the water inside the boiler gets too hot, causing a safety switch to Cut off the system to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the heat exchanger that restricts flow.

This issue often appears when the heating is first turned on after summer, as the internal pump can seize up after long periods of inactivity.

Typical repair cost £120-280 (including labour)

DIY fix possible

Check that all radiator valves are fully open to allow water to circulate.Ensure your system pressure is topped up to between 1 and 1.5 bar.Turn the boiler off and on again, or press the 'Reset' button to clear the lockout once the system has cooled down.

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Vokera models that show the E020 fault code

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

Source

Vokera E020 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026