Good morning my name is ***** ***** will look into this issue for you.
Please give me a few minutes to look up you model spec
It does appear your model doesnt have a filter, most likely this will be handled by the washer pump filter\drain.
I would start by cleaning the pump drain, which is found behind the bottom kick board, drain the water out with the hose, then remove the cap and give it a wash, use a rag to clean inside the void where the filter sits then put it back in place - this is documented under section 7.4 on page 26 of the user manual.
If after cleaning the filter your still finding excessive heat present this would suggest a temp sensor fault, and would need an engineer to come out to replace the NTC (sensor), which is around £15 from here.