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BoilerCodes
F6Ideal

Ideal F6: outside sensor fault

Checked against Ideal's own documentation: Ideal Logic Combi ESP1 installation and servicing instructions (UIN 222353) and 1 more source. Last reviewed October 2026. How we check

Check these first, then call an engineer

Ideal describes F6 on Logic Combi (ESP1) boilers as: outside sensor fault.

What you can safely do

  1. Reset the boiler once, as Ideal advises.

Call a Gas Safe engineer if

  • F6 comes back. Ideal says an engineer visit will be needed: quote the code when you call.
Find a Gas Safe engineer near you Opens the official Gas Safe Register search.

Applies to Logic Combi (ESP1). Codes can differ between models, so check your manual.

What F6 means on each Ideal model

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

ModelMeaning
Logic Combi (ESP1)Outside sensor fault

Common questions about Ideal F6

Can I fix Ideal F6 myself?

Only the checks listed above. If they don't clear it, it needs a Gas Safe registered engineer.

Nearby Ideal codes

See all 23 Ideal codes

Sources

Last reviewed October 2026. Spotted something that doesn't match your manual? Email hello@boilercodes.co.uk and we'll check it. How we check