BoilerFaultCodes Excessive temperature on primary circuit
Excessive temperature on primary circuit
Biasi M96E Fault codes & diagnostics
12 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 24 kW 2004-2008 Discontinued
Replaced by: Parva M96.24SM
Download the Biasi M96E manual
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The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 12 Unrated
Just want the most common Biasi M96E faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 12 documented codes
Tap any card for details
Faulty air pressure switch
Faulty air pressure switch
Faulty c.h. temperature probe NTC
Faulty c.h. temperature probe NTC
Faulty d.h.w temperature probe NTC
Faulty d.h.w temperature probe NTC
Faulty Electronic control/ignition p.c.b.
Faulty Electronic control/ignition p.c.b.
Faulty flue temperature probe NTC
Faulty flue temperature probe NTC
Faulty primary circuit
Faulty primary circuit (no water or absence of flow)
Flue temperature probe NTC lockout
Flue temperature probe NTC lockout
Lack of burner ignition
Lack of burner ignition (no ignition signal from the full sequence ignition device)
Lack of power supply or faulty electronic control p.c.b.
Lack of power supply or faulty electronic control p.c.b.
N/A
Excessivetemperatureonprimarycircuit
Safety thermostat lockout
Safety thermostat lockout