Biasi Aquapiu 2002 Fault codes & diagnostics

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

Combi Natural GasLPG 24 kW 2002-2007 Discontinued

The fault code is already on your display

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

Fault codes

All 2 documented codes

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Lock lamp on

Your boiler is failing to light the gas even though it is trying to spark, causing the system to shut down for safety.

High DIY-safe £120-300

What to check first

  1. Check that your gas emergency control valve is in the 'on' position
  2. Verify if other gas appliances in your home, such as a hob, are working correctly
  3. Press and hold the reset button for 2-3 seconds to attempt a restart

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Electrode
  • Printed Circuit Board (PCB)
Full explanation for Lock lamp on
Lockout lamp (red) on

Your boiler is lighting up but fails to recognise its own flame, causing it to shut down for safety.

High Engineer only £120-280

Parts commonly replaced

  • Flame sensing electrode
  • Ignition lead
  • PCB
Full explanation for Lockout lamp (red) on