<p>Found the problem, apparently these v2.2, v2.2x boards have the <code>HEATER1</code> MOSFET controlled by pin 7, not pin 9 as in default <code>pins_RAMPS.h</code>. After setting <code>HEATER0</code> to use pin 7 everything works as expected.</p>

CC BY-SA 4.0
2022-03-22T02:04:16.060Z
2022-03-22T02:26:50.857Z
2022-03-22T02:26:50.857Z
user33578
<p>My CR10-S5 with Creality v2.2 mainboard recently suffered from the hotend heater transistor (MOSFET) failing short. After taking a look at the board, I tried to be clever and use the <code>HEATER1</code> output instead for my hotend. However, after swapping pins in <code>pins_RAMPS.h</code>, there is no response to turning on the heater. I have confirmed zero volts on the board output with a multimeter, so it shouldn't be a failed heater cartridge.</p>
<p>Are there any other lines of code I should be changing to get this to work? I am using TH3D Unified 2 firmware with BLTouch enabled.</p>

<marlin><hotend><creality-cr-10><th3d>
Program Creality v2.2 board to use HEATER1 transistor for HEATER0
user33578
# Program Creality v2.2 board to use HEATER1 transistor for HEATER0

(Asked by: username_0 on 2022-03-20)

My CR10-S5 with Creality v2.2 mainboard recently suffered from the hotend heater transistor (MOSFET) failing short. After taking a look at the board, I tried to be clever and use the `HEATER1` output instead for my hotend. However, after swapping pins in `pins_RAMPS.h`, there is no response to turning on the heater. I have confirmed zero volts on the board output with a multimeter, so it shouldn't be a failed heater cartridge.

Are there any other lines of code I should be changing to get this to work? I am using TH3D Unified 2 firmware with BLTouch enabled.

**Tags:** marlin, hotend, creality-cr-10, th3d


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## 1 answers

### Answer by username_0 on 2022-03-22. Score: 4

Found the problem, apparently these v2.2, v2.2x boards have the `HEATER1` MOSFET controlled by pin 7, not pin 9 as in default `pins_RAMPS.h`. After setting `HEATER0` to use pin 7 everything works as expected.


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