hot ends not responmding as they should

my main hot and works fine
but the second extruder heats up without me asking it to and will carry on heating up until it cuts out. even when i try to tell it to heat up to 200 degrees it will just carry on past that temp even though its showing me the temp


  • i just put a multi meter on the second heater and when i turn on the first one
    both of them power up
  • Is it a ramps where you have setup cooling fan to fan pin which is the same as heater pin for second extruder?
  • its an mks gen V1 and it seems that when the first hot end is powered up it also powers up the second one so i have disconnected it for now
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