Biasi M96E Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2000-2006 Discontinued

Replaced by: Parva M96.24SM

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.
10 High
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 10 documented codes

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30c

Your boiler has detected that the water temperature has reached an unsafely high level, causing the system to shut down for safety.

High Engineer only £120-£350

Parts commonly replaced

  • Pump
  • Overheat Thermostat
  • Main PCB
Full explanation for 30c
ER + 14 + Reset

Your boiler has detected an internal communication or electronics failure, meaning it cannot currently function to provide heat or hot water.

High Engineer only £180-£350

Parts commonly replaced

  • Main PCB
  • Wiring harness
Full explanation for ER + 14 + Reset
ER + 25 + Reset

Your boiler has stopped working because it has detected a lack of water circulation, often caused by the pump being stuck or air trapped in the system.

High Engineer only £120-£350

Parts commonly replaced

  • Circulation Pump
  • Main PCB
  • Pump Capacitor
Full explanation for ER + 25 + Reset
ER + 69

Your boiler has detected an internal communication error or a control board failure that prevents it from firing up.

High Engineer only £180-350

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness
Full explanation for ER + 69
ER 01 + Reset

Your boiler has failed to ignite or has lost its flame, causing it to shut down for safety.

High DIY-safe £100-£350

What to check first

  1. Check if your gas supply is active (e.g., check other gas appliances or your meter credit)
  2. Press and hold the 'Reset' button for a few seconds to restart the boiler
  3. Ensure the condensate pipe (the white plastic pipe outside) hasn't frozen in cold weather

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for ER 01 + Reset
ER 02 + Reset

Your boiler has stopped working because it has detected an overheating issue and needs to cool down before it can be used again.

High DIY-safe £100-£250

What to check first

  1. Wait for the boiler to cool down for at least 15 minutes.
  2. Turn the selector switch to the 'Reset' position for a few seconds and then back to 'On'.
  3. Check that all radiator valves are open and ensure the system pressure is between 1 and 1.5 bar.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Primary Heat Exchanger
Full explanation for ER 02 + Reset
ER 03 + Reset

Your boiler has detected a problem with how it is getting rid of exhaust gases or taking in fresh air, causing it to shut down for safety.

High Engineer only £100-£250

Parts commonly replaced

  • Air Pressure Switch
  • Fan
  • Flue Venturi
Full explanation for ER 03 + Reset
ER 10 + reset

Your boiler has detected low water pressure in the system, which is preventing it from heating up or providing hot water.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually two braided hoses or valves) under the boiler.
  2. Slowly open both taps/handles until you hear water entering the system.
  3. Watch the pressure gauge on the front of the boiler until it reaches between 1.0 and 1.5 bar, then close both valves tightly.

Parts commonly replaced

  • No parts usually needed
  • Pressure sensor
  • Expansion vessel recharge
Full explanation for ER 10 + reset
Li

Your boiler has failed to ignite because the burner did not light after several attempts, meaning your heating and hot water will not work.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances, like a cooker, are working to confirm gas supply.
  2. Verify that your gas meter has credit if you have a pre-payment meter.
  3. Turn the control knob to the 'R' (Reset) position for 2 seconds and then back to the 'On' position.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for Li
LP

Your boiler has detected that the water pressure is too low, causing it to shut down to prevent damage.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible braided hose) underneath the boiler.
  2. Slowly open the one or two taps on the hose until you hear water entering the system.
  3. Watch the pressure gauge and close the taps once the needle reaches between 1 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Pressure switch
  • Expansion vessel
Full explanation for LP