I have a laundry machine and I always try to wash things at the appropriate temperature, but when the machine is done the clothes/sheets etc. never feel warmer than room temperature. How do I find out if the heating element of the laundry machine is broken?


That’s either totally wrong or depends on where you live (and the model you have). Where I’m from, that’s not a thing. Washers are connected to a cold water supply and heat the water themselves.
I’m fairly certain that Japanese apartments (at least micro ones) only have a cold water hookup for washing machines.
Probably varies by area then. Around here, every washer I’ve ever owned (or used at an apartment complex) had two water lines going into it.
I don’t think I’ve seen that anywhere in Europe at least