Currently there are no after market spare parts available for this model.
Therefore the Platinum model can not be repaired. This page explains why.
The Platinum model has a 2 year warranty so we would advise contacting your retailer or GHD directly if under warranty.
If not perhaps consider purchasing some refurbished GHD irons HERE or purchase a new pair, but stick to the GHD MK4.2 or GHD MK5.0 as these will always be repairable.
Here are some photos of the GHD Platinums but note that the Platinums comes in all sorts of colours and patterns, the internals are all the same though:
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