My Delonghi coffee machine (ECAM 350.35.W) developed a fault after a couple of years of use. It would often give an "INSERT INFUSER ASSEMBLY" error when trying to turn it on, especially if it was already warmed up (cold starts on cold mornings tended to work fine!). Perhaps this was due to a faulty microswitch or similar so it was failing to properly detect the position of the infuser within the machine.

Delonghi charged £120 for the repair, including shipping both ways, which is about 1/4 of the new price. Came back fully cleaned, descaled, and serviced and has worked perfectly again ever since.

So hats off to Delonghi for designing repairable machines!