Potterton Kingfisher 2 RS100 Fault codes & diagnostics

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

Regular Natural Gas 1998 Discontinued
GC Number 41-607-21
Download the Potterton Kingfisher 2 RS100 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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Fault codes

All 2 documented codes

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A.(1)

Your boiler is unable to start because it cannot light the small pilot flame, meaning you will have no heating or hot water.

High DIY-safe £100-£250

What to check first

  1. Check that your home's main gas emergency control valve is in the 'on' position.
  2. Verify if other gas appliances, like a cooker or hob, are working to confirm gas supply.
  3. If you have a prepaid gas meter, ensure you have sufficient credit and the meter hasn't locked out.

Parts commonly replaced

  • Thermocouple
  • Pilot Injector
  • Gas Control Valve
  • Ignition Electrode

Related codes

Full explanation for A.(1)
A.(3)

Your boiler is unable to start because the small starter flame is not lighting, likely due to a tiny blockage in the gas supply line.

High Engineer only £90-160

Parts commonly replaced

  • Pilot Injector
  • Thermocouple

Related codes

Full explanation for A.(3)