This is used in more expensive models where a secondary evaporator is used to cool a second fridge freezer cavity, when the temperature reach a set point then the diverter valve with operate and allow refrigerant to flow to the second evaporator as well.
These valve use either synchronous motors or just a simple solenoid valve to open them when they are signalled.
What can go wrong with diverter valves
If the secondary fridge freezer cavity is not getting cooled but the primary is functioning ok then its a god sign the diverter valve may be faulty and its best to test it prior to replacing any parts as it could be a control issue and not a faulty valve, normally the fridges with these are fitted with self diagnostics and servicing modes where you can manually operate the valve to ensure all control function are fine.
Study up on the model your working on and see what information is available on the service modes and diagnostics.
The solenoid valves have a coil of wire and are easy to test just take a resistance measurement over the two terminals. Reading can be from 1-4 ohms but if you get Ol then the winding in damaged and needs replacement. Replacement means recovering and recharge of the system.
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