1) Check carrier supply: correct gas type, sufficient pressure, regulator not hunting, filters not saturated.

2) Leak check: soap test external fittings (carrier/sample), verify column/valve block connections, confirm vent lines are not blocked.

3) Verify oven temperature stability: confirm setpoint reached and stable; check heater/sensor wiring if fluctuating.

4) Confirm detector baseline with carrier only (no sample): if still noisy → detector/flow/temperature issue; if stable → sample contamination/conditioning issue.

5) Sample conditioning check: liquids/condensation, dirty filters, unstable sample pressure/flow, fast loop issues, heat tracing issues.

6) Electrical checks: verify grounding/earthing, check for loose detector signal cables, inspect power supply stability.

7) Corrective actions:

• Replace carrier filters / purifiers if contamination suspected.
• Fix leaks and stabilize regulator/flow control.
• Clean/inspect detector module (per manual) and verify again.