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EDIT: Full minimal example. The error does not occur if I have only these packages in the preamble:

\documentclass{scrartcl} \usepackage[utf8]{inputenc} \usepackage{siunitx} \usepackage{amsmath} \usepackage{booktabs} \usepackage{cancel} \usepackage{caption} \usepackage{cleveref} \usepackage{colortbl} \usepackage{csquotes} \usepackage{helvet} \usepackage{mathpazo} \usepackage{multirow} \usepackage{listings} \usepackage{pgfplots} \usepackage{xcolor} \DeclareSIUnit{\thermal}{t} \DeclareSIUnit{\electrical}{e} \begin{document} \SI{3200}{\mega\watt} \\ \SI{3200}{\mega\watt\thermal} \end{document} 

Now I've got an output where there is a space between MW and t: MW t (don't know how to post it here?).
How can I get rid of that space?
What is it with the original preamble that causes the error?
Thanks again for helping and reading so far!

EDIT: Full minimal example

\documentclass{scrartcl} \usepackage[utf8]{inputenc} \usepackage{siunitx}  \sisetup{inter-unit-product =$\cdot$} \usepackage{amsmath} \usepackage{booktabs} \usepackage{cancel} \usepackage{caption} \usepackage{cleveref} \usepackage{colortbl} \usepackage{csquotes} \usepackage{helvet} \usepackage{mathpazo} \usepackage{multirow} \usepackage{listings} \usepackage{pgfplots} \usepackage{xcolor} \DeclareSIUnit{\thermal}{t} \DeclareSIUnit{\electrical}{e} \begin{document} \SI{3200}{\mega\watt} \\ \SI{3200}{\mega\watt\thermal} \end{document} 

Error message:

! Missing } inserted. <inserted text> } l.23 \SI{3200}{\mega\watt\thermal} ? 

Update: I get an error if I include
\sisetup{inter-unit-product =$\cdot$}
I also deleted it from my original preamble and it works now.

Thank you all for helping, here is the line that I'm using now (for those who might encounter the same problem as me):
\sisetup{inter-unit-product=\ensuremath{{}\cdot{}}}

EDIT: Full minimal example (I hope this is it?)

Now I've got an output where there is a space between MW and t: MW t (don't know how to post it here?).
In any case, there must be something that hinders the compilation and I'd like to understand it. Thanks again for helping and reading so far!

EDIT: Full minimal example. The error does not occur if I have only these packages in the preamble:

Now I've got an output where there is a space between MW and t: MW t (don't know how to post it here?).
How can I get rid of that space?
What is it with the original preamble that causes the error?
Thanks again for helping and reading so far!

EDIT: Full minimal example (I hope this is it?)

\documentclass{scrartcl} \usepackage[utf8]{inputenc} \usepackage{siunitx} \usepackage{amsmath} \usepackage{booktabs} \usepackage{cancel} \usepackage{caption} \usepackage{cleveref} \usepackage{colortbl} \usepackage{csquotes} \usepackage{helvet} \usepackage{mathpazo} \usepackage{multirow} \usepackage{listings} \usepackage{pgfplots} \usepackage{xcolor} \DeclareSIUnit{\thermal}{t} \DeclareSIUnit{\electrical}{e} \begin{document} \SI{3200}{\mega\watt} \\ \SI{3200}{\mega\watt\thermal} \end{document} 

Now I've got an output where there is a space between MW and t: MW t (don't know how to post it here?).
In any case, there must be something that hinders the compilation and I'd like to understand it. Thanks again for helping and reading so far!