PID Autotune fails

  • Hello,
    I am having difficulty PID Autotuning my E3Dv6 Hotend at 240 (currently print PLA but want to print PETG) I havev a Rostock V3 with 12V PSU and heater cartridge. I am able to autotune at 210, but when I try for 240 I keep getting this message:

    10:30:32 PM
    M307 H1
    Heater 1 model: gain 393.7, time constant 246.7, dead time 2.7, max PWM 1.00, mode: PID
    Computed PID parameters for setpoint change: P41.7, I0.169, D78.3
    Computed PID parameters for load change: P41.7, I4.403, D78.3
    10:29:33 PM
    Auto tune of heater 1 failed due to bad curve fit (G=364.9, tc=280.1, td=-2.1)
    10:25:13 PM
    Auto tune phase 3, peak temperature was 239.5
    10:25:06 PM
    Auto tune phase 2, heater off
    10:22:05 PM
    Auto tune phase 1, heater on
    10:20:50 PM
    M303 H1 S240
    Auto tuning heater 1 using target temperature 240.0C and PWM 1.00 - do not leave printer unattended

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