They are also the three that keep the expensive rows away, and on this make in this city they are not optional maintenance. A combi-steam oven works out its descaling interval from a water-hardness figure set at the factory, and the supply across Miami-Dade, Broward and Palm Beach is harder than that figure — so the reminder arrives after the scale does, and the steam generator pays for it.
The same shape twice more. A ventless dryer whose condenser block is packed runs long cycles at higher load for years before it complains, and the compressor is what wears. A refrigeration condenser coated in damp dust imitates every cooling failure on this site and is not a part at all. All three are on the maintenance page and all three cost less than what they prevent.