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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.

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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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