Hi, Without having the benefit of seeing the picture your refer to, it's difficult to offer better advice.
However, I'm sure that your model is not known as a CXL5N, it will be a CXLSN. (The 'S' means it is a slimline varient model)
With this in mind, you may have been searching for instructions online for the wrong model and not the slimline version.
Here is a link to a CXLSN owners manual, which I hope will be of use:
https://www.dimplex.co.uk/sites/default/files/assets//CXLS_Operating_Instructions_Issue_002.pdf
Use the "add an answer" button to post a relpy and let us know if this manual is the answer to your question or not in order to help future users of this site.
Rupert
April 2020
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