Dont know which wire connects where?
4-function switch can be 4 individual switches in a bank of switches, or it can be a combination of switch and timers.
Some timers need a neutral wire, while others, such as spring-wound timers do not need neutral wire: each of these items is wired separately.
Copy following link for switch illustrations, including 4 function switches.
http://waterheatertimer.org/How-to-wire-switches#gang
http://waterheatertimer.org/How-to-wire-timers.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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