For Agilent 6820 GC FID detector ignition failure, professional repair usually involves the following steps: 1. **Igniter Check**: Confirm the igniter functions normally (e.g., glows red during ignition sequence). 2. **Collector & Ignition Plug Inspection**: Examine for damage or contamination. 3. **Gas Ratio Adjustment**: Ensure proper H₂/air/makeup gas ratios (typically ~1:10:1). 4. **Gas Flow Optimization**: Avoid excessive makeup gas (dilutes H₂) or overly high H₂ flow (which may cool the igniter). 5. **Detector Conditioning**: If there’s contamination or condensation, raise the detector temperature to 230-300°C for gas purging or aging (0.5-1h) to remove moisture or residues. 6. **Nozzle Check**: Inspect the nozzle for cracks (which disperse H₂ and hinder ignition). 7. **System State Reset**: If the instrument misjudges ignition status, turn off detector gases to extinguish any residual flame, then restart gases and re-ignite. If you face persistent ignition issues or need professional technical support, **Jiangxi Bio** can provide comprehensive solutions. We specialize in after-sales repair and maintenance for Agilent (including 6820 GC) and other brands like Thermo Fisher, Waters, etc. Our services cover repair, cleaning, maintenance, and we offer genuine spare parts, consumables, and application consulting. For reliable instrument support, consider our one-stop services to minimize downtime and ensure optimal performance.