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F.85

Glow-worm fault code

Glow-worm F.85: flow and return heating sensor fault

Engineer only

Glow-worm describes F.85 on Betacom A range boilers as: flow and return heating sensor fault.

What you can safely do

There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.

Find a Gas Safe engineer near you Opens the official Gas Safe Register search.

Applies to: Betacom A range. Codes can differ between models, so check your manual.

From Glow-worm's own fault tables. Your model name is usually on the front of the boiler or in the user manual.

Model	Meaning
Betacom A range	Flow and return heating sensor fault

Can I fix Glow-worm F.85 myself?

No. It needs a Gas Safe registered engineer to diagnose. Tell them the exact code and your boiler's model name.