E11 Medium

Warmflow E11 Fault Code

The Warmflow E11 fault code means: your boiler's internal temperature sensor has slipped out of its correct position or is sending an unusual reading, meaning the system cannot safely monitor the water tank temperature.. It appears on 3 Warmflow models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Tank Limit — displaced tank NTC temperature sensor probe (logged only, not shown on LCD); consult Service Engineer
Typical repair cost £90-160 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Warmflow models that show the E11 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Warmflow E11 fault code information on this page is sourced and cross-checked against the official Warmflow service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026