MAXTEMP / thermistor error on the Elegoo Neptune 4

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

The printer reports a MAXTEMP error, indicating the thermistor is reading an abnormally high temperature.

How to fix MAXTEMP / thermistor error

Check the thermistor

Inspect the thermistor wiring for shorts and reseat it. Replace if damaged.

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

Difficulty: ★★ Est. 15 min

Check the heater

Verify the heater cartridge is not shorting and is seated correctly.

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

Difficulty: ★★★ Est. 20 min

Replacement parts for the Elegoo Neptune 4

Elegoo Neptune 4 Nozzle Elegoo Neptune 4 Hardened Steel Nozzle Elegoo Neptune 4 PLA Filament Elegoo Neptune 4 Build Plate Elegoo Neptune 4 Hotend Assembly Elegoo Neptune 4 Magnetic Bed Sheet Elegoo Neptune 4 PTFE Tube Elegoo Neptune 4 Nozzle Set

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