Low
Green LED flashing rapidly (8/sec) on Vokera Sabre 35HE

Your boiler is currently in a normal pre-heat mode designed to provide hot water more quickly; this is a standard operating feature and not a fault.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

SARA pre-heat function active (normal)

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

DIY fix possible

No action is required as the boiler is working correctly.If you wish to stop the flashing, you can turn the 'SARA' function off by rotating the temperature selector dial out of the 'SARA' range.

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