Ideal Mexico Super Fault codes & diagnostics

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

Regular Natural Gas 14-36 kW 1994-2005 Discontinued

Replaced by: Mexico HE

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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Neon I3

This is a normal status indicator showing that your boiler is receiving power and is ready to operate.

Low DIY-safe

What to check first

  1. No action required as this indicates the power is switched on
  2. If the boiler is not heating, check that your thermostat or programmer is calling for heat
  3. Ensure the gas supply is turned on
Full explanation for Neon I3
Neon SG1

Your boiler is currently trying to light the burner to provide heat, which is a normal part of its startup sequence.

Low DIY-safe £0-120

What to check first

  1. No action required; this is a normal status indicator
  2. Monitor the boiler to ensure the light stops flashing once the burner ignites
  3. If the light continues to flash without the boiler firing, contact a professional

Parts commonly replaced

  • Ignition Electrode
  • Flame Sensor
  • Gas Valve
Full explanation for Neon SG1