thermal-runaway Troubleshooting

Thermal runaway error on the SUNLU Filament Trockner S1 Plus

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

The printer reports a thermal runaway and shuts down to prevent a fire risk. The thermistor or heater may be faulty.

How to fix Thermal runaway error

Check the thermistor

Inspect the thermistor wiring and reseat it in the hotend. Replace if damaged.

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

Difficulty: ★★★ Est. 20 min

Verify the heater cartridge

Check the heater cartridge is seated and not shorting. Replace if faulty.

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

Difficulty: ★★★ Est. 20 min

Replacement parts for the SUNLU Filament Trockner S1 Plus

SUNLU Filament Trockner S1 Plus Nozzle SUNLU Filament Trockner S1 Plus Hardened Steel Nozzle SUNLU Filament Trockner S1 Plus PLA Filament SUNLU Filament Trockner S1 Plus Build Plate SUNLU Filament Trockner S1 Plus Hotend Assembly SUNLU Filament Trockner S1 Plus Magnetic Bed Sheet SUNLU Filament Trockner S1 Plus PTFE Tube SUNLU Filament Trockner S1 Plus Nozzle Set

← All SUNLU Filament Trockner S1 Plus error codes

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