How much does it cost to fix Biasi error code E42?

Typical repair cost for the Biasi E42 fault is £120-£250 including labour.

E42 High

Biasi E42 Fault Code

Q: What does the Biasi E42 fault code mean?

Your boiler has shut down because a safety component detected it was getting dangerously hot, and this fuse now needs to be replaced.

The Biasi E42 fault code means: your boiler has shut down because a safety component detected it was getting dangerously hot, and this fuse now needs to be replaced.. It appears on 3 Biasi models in our database.

Technical description: Intervention of safety thermal fuse

Typical repair cost £120-£250 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Biasi models that show the E42 fault code

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

Advance 25C Repair: £250-450
Antares Combi Repair: £120-£250
Rinnova Adaptive Combi Repair: £120-350

Source

Biasi E42 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

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