Halstead Buckingham 4 100CFF Fault codes & diagnostics

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

Regular Natural Gas 2002-2006 Discontinued
GC Number 41-333-98
Download the Halstead Buckingham 4 100CFF manualThe official installation and service manual (PDF). 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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Reset LED is lit

Your boiler has stopped working because it has detected an issue with the water temperature or the ignition process and needs to be reset.

High Engineer only £120-250 Shared across the Hepworth Heating Halstead Buckingham 4 range

Parts commonly replaced

  • NTC Temperature Sensor
  • Ignition Electrode
  • PCB
Full explanation for Reset LED is lit
Reset neon

Your boiler has stopped because it failed to light or stay lit, which means you currently have no heating or hot water.

High DIY-safe £120-250 Shared across the Hepworth Heating Halstead Buckingham 4 range

What to check first

  1. Turn the boiler temperature control dial to the '0' position.
  2. Wait for at least 30 seconds to allow the internal safety systems to reset.
  3. Follow the manufacturer's lighting instructions on the boiler panel to restart the unit.

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for Reset neon