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My Siemens dishwasher, about nine years old, makes a really loud squealing noise for 10-20 minutes at a time while it's in the middle of its programme. Think banshee with a stubbed toe, about 2kHz, and loud enough to be heard throughout the house. It doesn't do that when filling or emptying...

Ordinary Honeywell V4073A 3 port mid position valve, apparently operating normally. Hot water goes where it's supposed to go when HW, CH or both are called for. Valve returns to default position when not energized. HOWEVER, if the last position was CH only and the CH thermostat then stops...

As subject - the machine does what it's supposed to do otherwise and there are no leaks evident. The RCD is a 30mA type. Wash cycles complete just fine, including 60deg or 90deg ones, so the heater doesn't seem to be the problem. If I reset the RCD after it trips, the spin cycle completes OK...

I'm asking because the one in my central heating system isn't installed in accordance with the drawings available at circulatingpumps.net Now, if it just contains some baffles to slow down the water flowing through it and allow air to collect and escape at the highest point, then it won't make...