In case it helps anyone, the firmware that came with my Duet Wifi claims that the firmware is 2.0(RTOS) (2018-06-05b3), and that there was an over-power problem on the first heater (despite nothing being connected). However, once I went through the Configurator steps at https://configurator.reprapfirmware.org/ as a 1.21+ firmware, once I had uploaded the files the errors all went away.
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Not all boards have an erase switch, mine does not (Duet 2 Wifi)
In case it helps anyone, the firmware that came with my Duet Wifi claims that the firmware is 2.0(RTOS) (2018-06-05b3), and that there was an over-power problem on the first heater (despite nothing being connected). However, once I went through the Configurator steps at https://configurator.reprapfirmware.org/ as a 1.21+ firmware, once I had uploaded the files the errors all went away.