How much does it cost to fix Firebird error code e1?

Typical repair cost for the Firebird e1 fault is £90-180 including labour.

e1 High

Firebird e1 Fault Code

Q: What does the Firebird e1 fault code mean?

Your boiler's internal temperature sensor is reporting an error, which means the system cannot monitor its own heat levels and has shut down as a precaution.

Also written as E1 — same fault.

The Firebird e1 fault code means: your boiler's internal temperature sensor is reporting an error, which means the system cannot monitor its own heat levels and has shut down as a precaution.. It appears on 5 Firebird models in our database.

Technical description: Thermistor fault.

Typical repair cost £90-180 (including labour)

Engineer required

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

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Firebird models that show the e1 fault code

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

Source

Firebird e1 fault code information on this page is sourced and cross-checked against the official Firebird service / installation manuals for each affected model.

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