I'm running a RAMPS 1.4 kit that I assembled myself from ultimachine.com with Kliment's Sprinter firmware and Pronterface/ReplicatorG. Initially I connected my heater to pin D9 on the board and realized D9 is for the fan. In ReplicatorG, I could get the heater to heat up by clicking on fan enable, the LED for D9 would turn on and I could see the thermistor readings. Now, whenever I have my heater on D10, it won't turn on and the red LED for D10 doesn't turn on when I send commands from either ReplicatorG or Pronterface. However, it does turn on if I first preheat the heater by connecting the heater to D9, pass current through it by clicking fan enable for a few minutes, disconnecting, shutting down, switching heater to D10 pins, restarting and reconnecting. The heater works only after carrying out this sequence. Any advice on what could be causing this would be appreciated :) -ak https://reprap.org/forum/read.php?219,112469,112469#msg-112469 Thu, 08 Oct 2026 21:25:59 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,112469,112742#msg-112742 https://reprap.org/forum/read.php?219,112469,112742#msg-112742
I replaced the thermistor and it works like a charm.

Thanks for the suggestion :)]]> d4rwen RAMPS Electronics Sat, 07 Jan 2012 23:48:11 -0500 https://reprap.org/forum/read.php?219,112469,112684#msg-112684 https://reprap.org/forum/read.php?219,112469,112684#msg-112684 Andrew Smith RAMPS Electronics Sat, 07 Jan 2012 12:02:09 -0500 https://reprap.org/forum/read.php?219,112469,112469#msg-112469 https://reprap.org/forum/read.php?219,112469,112469#msg-112469
Initially I connected my heater to pin D9 on the board and realized D9 is for the fan. In ReplicatorG, I could get the heater to heat up by clicking on fan enable, the LED for D9 would turn on and I could see the thermistor readings.

Now, whenever I have my heater on D10, it won't turn on and the red LED for D10 doesn't turn on when I send commands from either ReplicatorG or Pronterface. However, it does turn on if I first preheat the heater by connecting the heater to D9, pass current through it by clicking fan enable for a few minutes, disconnecting, shutting down, switching heater to D10 pins, restarting and reconnecting. The heater works only after carrying out this sequence.

Any advice on what could be causing this would be appreciated :)

-ak]]> d4rwen RAMPS Electronics Thu, 05 Jan 2012 23:36:15 -0500