What does the Glow-worm S.20 fault code mean?

This code is not a fault at all; it simply indicates that your boiler is currently working correctly to provide you with hot water.

How much does it cost to fix Glow-worm error code S.20?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Manufacturer manual

The domestic hot water demand is activated.

Shared across the Flexicom 24c / 28c range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

No action is required.This is a status message confirming your boiler is operating normally when a hot tap is turned on.

Boiler cover options

A cover plan would handle faults like S.20: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

Almost always a stuck diverter valve on a combi.

Break-even maths on monthly cover.

7 signs repair isn't worth it anymore.