Baxi 618 System 2 Fault codes & diagnostics

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

System Natural Gas 2023-present
GC Number 41-884-02
Download the Baxi 618 System 2 manualThe official installation and service manual (PDF), the document these fault codes were read from. 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 →

Fault codes

All 2 documented codes

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10

Your boiler has experienced a persistent ignition or flame failure that requires a manual reset to restart.

High DIY-safe £100-£250

What to check first

  1. Locate the reset button on the front control panel.
  2. Press and hold the reset button for at least 5 seconds.
  3. Check that your gas prepayment meter has credit and that other gas appliances in your home are working.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Lead
Full explanation for 10
254

Your boiler is having trouble communicating with your thermostat or wall controller, meaning they aren't talking to each other correctly.

High Engineer only £90-250

Parts commonly replaced

  • Room Thermostat
  • Receiver Unit
  • Boiler PCB
Full explanation for 254
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