Low
2 08 on Ariston E-Combi Evo

Your boiler has detected that the water temperature inside it is dangerously low and could freeze, so it is temporarily running the pump to protect itself.

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

Collector frost protection temperature

From this model's manual
Verified against the Ariston E Combi Evo Combi installation & service manual, page 37.
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

Ensure the boiler power supply remains switched onCheck that the gas supply is active so the burner can fireVerify that the central heating valves under the boiler are openIf the boiler is in a cold area, ensure the room thermostat isn't turned completely off

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Avoid the next call-out bill

A cover plan would handle faults like 2 08: no call-out fees, no surprise bills.

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