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I had a similar problem with my Miele after re-installing it when our new kitchen went in. I borrowed the carpenters compressor and blew compressed air through the drain hose, sticking the nozzle of the airgun down the drain hole near the impeller and detaching the end of the drain hose from the plumbing. It cleared some junk from the drain and its worked fine ever since.
golgol
Our miele dishwasher inlet drain light is showing, and I wanted to bounce my logic off the hive.
The Internet gives two possible causes, 1) drain impeller
https://youtu.be/uLZX3AB2k5Q
I've checked the area is free of debris and the propeller spins freely. I've also opened the dishwasher after turning on and have seen it spinning.
2) circulation pump rotar
https://youtu.be/Ih9tfZ7k3Ns
I managed to get the impeller (?) to start turning using the fork trick in this video. Although the previous video I'd followed implied that you moved it sideways / left-right rather than rotating it, so I'm concerned I could have damaged it with my hamfistedness.
The error light went off for a bit, but is now back on.
We're in a hard water area so I wondered if soaking that area in vinegar overnight / for a prelonged period would help break down possible build up? Then give it another go after a good veg oil soak.
Any other thoughts / hacks?
Is there something stronger than vinegar I should be using? I'd worry about drain cleaner damaging the metal and rubber.
I'm happy to call out a repairman, but given I previously sorted the poor washing by giving it a proper clean, I thought I'd at least give it a couple of attempts.
Cheers.