City water here is hard enough that it shows. Most people notice it first on glassware and assume the machine is failing. The machine is fine; the water is depositing calcium on everything it heats, and the glasses are simply the visible end of it.
Scale is an insulator
Heat water and some of the dissolved mineral comes out of solution onto the hottest surface available, which is the heating element. Scale conducts heat poorly, so the element has to run hotter to deliver the same energy. Hotter means shorter life, and the eventual problem is sudden rather than gradual.
The same deposit narrows spray arm jets, blocks inlet screens and coats the sensors that decide when a cycle is done. You get a performance complaint first and a breakdown later.
What it looks like as it progresses
- Glasses cloudy in a way that does not rinse off.
- Cycles quietly getting longer without a setting change.
- White crust around the spray arm holes or inside the door seal.
- Top rack coming out dirty while the bottom is fine.
- No heat in the dry cycle, which is the element finally going.
What actually helps
A whole-house softener solves it outright and does the same favour for every other appliance in the building. Short of that: descale twice a year rather than annually, keep the rinse aid reservoir filled rather than treating it as optional, and pull the filter monthly and rinse the scale off it as well as the food.
On a machine with a stainless tub, run the hot tap at the sink before starting a cycle so the fill is hot from the first minute. It is a small thing and it shortens the run.
If the element has already gone
It is a repair, not a replacement, in nearly every case, and on an integrated machine it is emphatically worth doing. Starting prices are on the pricing page.
Call (844) 398-4960 and describe what the glasses look like. It narrows things faster than you would expect.
