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2. Ignition electrode worn, contaminated or mispositioned
3. Flame sensor/ionisation probe fault
4. Gas valve not opening or low gas valve output
Test: Check gas meter, isolation valves open, test inlet working pressure at appliance.
Expected: Minimum 18 mbar at working rate on natural gas.
If wrong: Restore gas supply before proceeding.
Test: Inspect electrode tip, gap and lead. Check for carbon tracking or cracking.
Expected: Clean tip, correct gap, no damage to lead or ceramic.
If wrong: Replace electrode assembly.
• Ionisation signal: typically 1–10 µA when flame established
• Gas valve resistance: check manufacturer data
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