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fan turns on heater ... and melts hot end :(

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Basically when the fan comes on to cool the hotend assemberely the hot end heater is turned on to max and melts the hot end....

This is described here on the marlin git hub

https://github.com/MarlinFirmware/Marlin/issues/11661

The answer seems to be here , but I cannot find out where to put the changed code.

There is not Rigiboard.h file , or I get errors no Ramps.h file exists , if i try to modify the code, or it just has the same fault.

M106... M107 fan on / off ... just switches the heater on/ off ... no thermal control ... just goes into melt down.

I am sure its simple... to someone who knows how.... :)

Appreciate any help you can offer :)
Regards
John