Heating Related

This page describes heating function checks, PID calibration, and heating detection parameters. If Klipper shutdown has already occurred, please refer to Temperature, Heating, and Extrusion Errors first.

Checking Heating Function

High Temperature Warning

Heating operations generate high temperatures. Do not touch the hot end or heat bed, and ensure no flammable materials are nearby.

1. Check Heating Port LED Status

• LED Off: Indicates the heating port is not working. First, check if the pin configuration is correct.
• LED On: Indicates the heating port is working. You can verify continuous temperature rise via the web interface temperature graph.

Safety Notice

General users should prioritize checking heating anomalies through the web interface temperature graph, replacing standard heating cartridges/thermistors, or contacting after-sales support. Do not disassemble the power supply, touch exposed terminals, or check mains voltage heat bed wiring.

2. Power Supply Rating Check

• Verify that the power supply's rated power meets the device requirements. Insufficient power capacity may prevent the heating temperature from reaching the set value.
• Power calculation formula: Voltage × Current = Maximum Output Power.
• When the power supply is rated 24V 5A, the maximum output power is 120W. If the heating port uses 40W, remaining 80W for other components may be insufficient for overall needs.
• When the power supply is rated 24V 10A, the maximum output power is 240W, usually sufficient for the heating port and other components.

3. Troubleshooting Suggestions

Power Off

Before inspecting heating elements, thermistors, heat beds, fuses, SSRs, MOSFETs, or related wiring, completely turn off the printer, disconnect the power supply, and wait for the hot end and heat bed to cool down.

• If the heating port cannot reach the set temperature, power off and wait for cooling, then check the heating element and connecting wires for damage or poor contact.
• If the heating port has no control signal (LED off) but still outputs, first check the corresponding pin configuration and save.
• If abnormal output persists after saving the configuration, the MOSFET or external module may be damaged. Stop using it and contact after-sales support.
• If the power supply capacity is insufficient, replace it with a larger, qualified power supply to ensure system stability.

PID Temperature Calibration

PID calibration optimizes the stability and response speed of heater temperature control.

Calibration Commands

# Extruder PID calibration (change TARGET to your common printing temperature)
PID_CALIBRATE HEATER=extruder TARGET=200

# Heated bed PID calibration (change TARGET to your common bed temperature)
PID_CALIBRATE HEATER=heater_bed TARGET=60

Important Note

After calibration, you must execute SAVE_CONFIG to save the parameters, otherwise the calibration data will be lost after a restart.

Temperature Rises Very Slowly

If hardware and power supply have been confirmed normal, but the heating rate is too slow causing Klipper false errors, refer to the following configuration to relax heating detection thresholds.

Caution

This configuration cannot be used to mask actual heating faults. If temperature does not rise at all, fluctuates violently, or wiring is abnormal, resolve hardware issues first.

Extruder

printer.cfg

[verify_heater extruder]
max_error: 120
check_gain_time: 120
hysteresis: 50
heating_gain: 2

Heated Bed

printer.cfg

[verify_heater heater_bed]
max_error: 120
check_gain_time: 120
hysteresis: 50
heating_gain: 2

Parameter Description

Parameter	Default	Description
max_error	120	Maximum allowable temperature deviation
check_gain_time	20	Heating detection time window. Increase if heating is slow
hysteresis	5	Temperature fluctuation tolerance
heating_gain	2	Heating rate judgment parameter. Adjust only after confirming hardware is normal

For more details, refer to: verify_heater optimization.