Ideal Classic NF 70 Fault codes & diagnostics

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

Natural Gas
GC Number 41-429-77
Download the Ideal Classic NF 70 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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Fault codes

All 3 documented codes

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Neon I1

Your boiler is failing to start because it detects that the internal fan system is not operating correctly, likely due to a sensor incorrectly reporting air pressure levels before the system has even begun to run.

High Engineer only £150-250

Parts commonly replaced

  • Air pressure switch
  • Fan assembly
  • Venturi

Related codes

Full explanation for Neon I1
Neon I3

Your boiler is receiving power and is currently in its normal standby state, meaning it is ready to fire up whenever you turn on your heating or hot water.

Low DIY-safe

What to check first

  1. No action is required as this is a normal operating status light
  2. Check your thermostat settings if you were expecting the heating to be on
Full explanation for Neon I3
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