Unfortunately there is no 'trade secret' when it comes to manuals.
Googling the model number is often the best first option and will sometimes throw the right option up
Otherwise it's trying to navigate the manufacturer's website, and work out which model number they need (not always the same as the one on the front of the device!), It;s not helped when so many manufacturers trade under multiple names and brands.
There are several sites that have lots of manuals, but they are often infested with ads and difficult to navigate, especially on mobile.
Even then, actual wiring diagrams are often in short supply.
Is
this the instruction manual for the one you need? Also available via
Argos.
One tip I do often use with electrical products (not appliances) - if it's sold by
tlc, then they often have a link to the manual on the product page - though it is sometimes not the up to date one.
