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
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
- 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)
More guides for GSI (AGCO) GSI X-Stream / Topdry
How to fix moisture overshoot on a GSI X-Stream Grain Dryer
Moisture overshoot over-dries grain and wastes fuel. Check the moisture sensor calibration, reduce the discharge speed, and verify the temperature setpoint against the incoming grain moisture.
How to respond to high plenum temperature on a GSI X-Stream Grain Dryer
High plenum temperature risks grain scorching and bin fire. Immediately reduce burner output, increase airflow, and check for obstructed airflow paths before resuming normal operation.
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