Unknown
Er 05 on Biasi Advance Plus 30S ErP

Biasi Advance Plus 30S ErP fault code Er 05

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

What the manual says

Manufacturer manual

Faulty fan control system

From this model's manual
Verified against the Biasi/Biasi Advance 25c Combi 2 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

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 →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like Er 05: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

All 33 fault codes on the Advance Plus 30S ErP

Seeing a different code? Every code this model can display, in one place.

An 11E01E02E03E04E05E06E07E08E09E10E14E25Er 01Er 02Er 03Er 04Er 06Er 07Er 08Er 09Er 10Er 11Er 12Er 13Er 14Er 19Er 25Er 69Er 99L10Li 01

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

New boiler cost 2026

Realistic UK prices for a swap.

Read →