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Have you tried soaking the area with a solution of washing soda/soda crystals,
normally on the same shelf as soap powders in 1kilo bags for around £1.We also use it for every wash in the washing machine, to counter the hard water of Affinity Water, (was Three Valleys Water), in outer north west London.
Alternatively any of the scale removers based upon sulphamic acid,
which are often gelled, seem to work better around handbasin taps etc.
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.