How much does it cost to fix Baxi error code E.02 – .21?

Typical repair cost for the Baxi E.02 – .21 fault is £80-160 including labour.

E.02 – .21 High

Baxi E.02 – .21 Fault Code

Q: What does the Baxi E.02 – .21 fault code mean?

Your boiler's electronic settings have been altered or are misconfigured, preventing it from operating correctly.

Also written as E0221 — same fault.

The Baxi E.02 – .21 fault code means: your boiler's electronic settings have been altered or are misconfigured, preventing it from operating correctly.. It appears on 24 Baxi models in our database.

Technical description: Jumper 3 changed – check position of jumper 3.

What causes the Baxi E.02 – .21 fault?

This fault occurs when the internal electronic settings of the boiler have been accidentally altered or the configuration 'jumper' on the circuit board is in the wrong position. It usually happens during a repair or component replacement where the electronic settings haven't been correctly matched to your specific boiler model. Because the boiler's computer no longer knows exactly how it should be configured, it shuts down as a safety precaution.

Typical repair cost £80-160 (including labour)

Engineer required

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

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Baxi models that show the E.02 – .21 fault code

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

Source

Baxi E.02 – .21 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026