Maintenance or, should we say, the near absence of maintenance is one of the major benefits of electric heating installations. Roughly speaking, you just need to perform a thorough cleaning of your appliances, once or twice a year, preferably before winter. Vacuuming and dust-removal, with a dry or slightly damp cloth, is more than enough. It is not much, but it is needed. Otherwise, the accumulation of dust alters the smooth functioning of your appliances and leads to higher energy consumption.
While you are at it, take a look at the electrical connection. In particular, make sure the wall socket is still securely attached. If not, secure it with a screwdriver.
If your appliance is electronically controlled, the precision of its regulation system is unalterable over time. No further manipulation is needed, except in case of changing lifestyle. Then, simply select another programming mode based on your new habits. Here you are, nothing more and nothing less is required, what's more, this is free of charge!