High
E080 on Vokera Unica MAX

Your boiler has detected that the water returning to it is too hot or that the temperature difference between the water leaving and returning is abnormal, so it has shut down to prevent damage.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

fault return line probe • return line probe overtemperature • outlet/return line probe differential alarm

From this model's manual
Verified against the Vokera Unica Max installation & service manual, page 9.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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