TL;DR

Burner ignition failure stops drying. Check the gas supply pressure, igniter spark, and flame sensor before calling for service.

What you might see

dryer control showing ignition fault or lockout
burner attempting to fire but no flame established
gas pressure alarm on the control panel
burner runs cold and grain discharges at ambient temperature

Likely causes

Tap to mark as ruled out

Gas supply pressure below the minimum for stable ignition
Igniter spark gap fouled with carbon or contamination
Flame sensor (UV cell or thermocouple) contaminated or failed, unable to confirm flame
Gas valve not opening due to solenoid fault or interlock not satisfied

Required tools

Gas pressure gauge
Wire brush for electrode cleaning
Dry cloth for sensor cleaning

Safety first

Never bypass a gas valve interlock. Uncontrolled gas release is a fire and explosion hazard.
Limit resets to one attempt per investigation. Multiple resets accumulate unburned gas in the combustion chamber.
Grain dust explosion risk near grain dryer exhaust. Maintain clear separation between dust sources and ignition.

Procedure

7 steps · ~30 min

1
Read the burner control panel fault code. Document the fault before attempting a reset.[1]
2
Check the gas supply pressure at the burner manifold. Pressure below the minimum for the burner model prevents ignition. Verify the main gas valve is fully open.
Warning: Never attempt to bypass or jump out a gas valve interlock. Gas system work requires a qualified gas technician.
3
Verify that all burner safety interlocks are satisfied on the control panel. High-temperature limits, airflow switches, and pressure switches must all show healthy.
4
Inspect the igniter electrodes for carbon fouling or wear. Clean the electrode tip with a wire brush if fouled. Measure the spark gap against the specification.[1]
5
Inspect the flame sensor (UV cell or flame rod). Clean the sensor window or rod with a dry cloth. A contaminated sensor fails to confirm flame and locks out the burner.
6
After cleaning, attempt one reset and ignition sequence. If ignition fails again, do not attempt multiple resets as gas accumulation is a hazard.
7
If the problem persists after inspection and cleaning, contact a qualified burner service technician for gas valve and ignition system testing.

Sources

GSI (AGCO) GSI X-Stream / Topdry Grain Dryer general technical documentation, GSI (AGCO)
Grain dryer burner ignition system diagnostics, general grain drying and combustion practice (general)

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