No pulling then fuse is not enough because that is only killing the power the comms is still live, it's a earth problem that will still be connected.

A small bit of work needed.
Jack her up take the front left/passenger wheel off and loosen the wheel liner at the back of the arch/footwell, the heater is located there. You shouldn't need to take the whole liner out, just enough to get your hand in and disconnect the plugs.
If the fault is fixed then just tape up the plugs and put it back together.

Obviously there is more work needed if you want to replace the heater to keep it working.