Biasi M96E Common Problems & Fault Codes (2026 Guide)

The most common Biasi M96E problems

The faults most likely to send a Biasi M96E into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 6 most common faults

N/A Engineer

Excessivetemperatureonprimarycircuit

Full guide for N/A

Excessive temperature on primary circuit Engineer

Excessive temperature on primary circuit

Full guide for Excessive temperature on primary circuit

Faulty c.h. temperature probe NTC Engineer

Faulty c.h. temperature probe NTC

Full guide for Faulty c.h. temperature probe NTC

Faulty d.h.w temperature probe NTC Engineer

Faulty d.h.w temperature probe NTC

Full guide for Faulty d.h.w temperature probe NTC

Faulty flue temperature probe NTC Engineer

Faulty flue temperature probe NTC

Full guide for Faulty flue temperature probe NTC

Faulty primary circuit Engineer

Faulty primary circuit (no water or absence of flow)

Full guide for Faulty primary circuit

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Biasi shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 12-code list for the Biasi M96E