Biasi Riva Plus M296.24SM Fault codes & diagnostics

5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

CombiSystem Natural Gas 24 kW 2011 onwards Discontinued
GC Numbers 47-583-2447-583-25

Replaced by: Inovia

Download the Biasi Riva Plus M296.24SM manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-583-24 Riva Plus HE M296.24SM/C 2011–present
47-583-25 Riva Plus HE M296.28SM/C 2011–present
Just want the most common Biasi Riva Plus M296.24SM faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 5 documented codes

Tap any card for details

Faulty air pressure sensor

Your boiler has stopped working because it cannot safely verify that the fan is moving harmful exhaust fumes out of the flue.

High Engineer only £120-220

Parts commonly replaced

  • Air Pressure Switch
  • Venturi Tube
  • Fan
Full explanation for Faulty air pressure sensor
Flame detection error

Your boiler has failed to light or cannot detect a flame, meaning it will not provide heating or hot water until the issue is resolved.

High DIY-safe £100-280

What to check first

  1. Check if your gas supply is active by testing another gas appliance like a hob.
  2. Try resetting the boiler by turning the control knob to the 'R' position for a few seconds.
  3. Ensure there is no frozen condensate pipe or blocked flue terminal outside.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Electrode
  • Printed Circuit Board (PCB)
Full explanation for Flame detection error
Lack of burner ignition

Your boiler is failing to light the gas flame required to heat your water and home.

High DIY-safe £120-350

What to check first

  1. Check that your gas supply is turned on and other gas appliances are working
  2. Check if your prepaid gas meter has sufficient credit
  3. Press and hold the reset button for five seconds

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for Lack of burner ignition
Lock-out signal lamp red

Your boiler is trying to start but cannot light the gas flame, causing it to shut down for safety.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances in your home, such as a hob, are working to confirm gas supply.
  2. Ensure your gas pre-payment meter (if applicable) has enough credit.
  3. Press the reset button on the control panel to attempt a restart.
  4. Verify that the white condensate pipe exiting the wall outside is not frozen or blocked.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
  • Flame Sensing Electrode
Full explanation for Lock-out signal lamp red
Safety thermostat lock out

Your boiler has overheated, causing it to shut down automatically for safety.

High DIY-safe £100-250

What to check first

  1. Check that all radiator valves are open to ensure water can flow properly.
  2. Wait for the boiler to cool down for at least 20 minutes.
  3. Rotate the selector switch to the reset position 'R' for a few seconds and then back to the desired setting.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Primary Heat Exchanger
Full explanation for Safety thermostat lock out