Bosch washing machine belt slipping
Hi Paul! My Bosch Maxx9 washing-machine (2yrs old) has a problem I can't diagnose. The belt OCCASIONALLY slips around rear drum-pulley causing high-pitched squeal, especially when attempting high-speed spin. Runs perfectly sometimes, other times it squeals like crazy. If the drum fails to turn properly for loo long, tacho-sensor ends programme. Similar to unbalanced load, but this occurs even with EMPTY machine. I'm experienced repairing my own washing machines (elements, bearings, timers...) With back removed: belt appears to have inadequate traction around the large drum-pulley. Belt is as tight as you would expect it to be. Replaced belt - same problem. Drain/trap all clear. Pump fine. Water empties completely. Motor spins freely/fast/quiet with belt removed. Drum spins freely/fast/quiet by hand. No play in drum. Tested wiring harness connections to motor (assuming high-speed connection dodgy). All OK. Motor is brushless. 1st guess: Small obstruction between inner/outer drums causing enough traction for belt to slip? Can't find anything. No bras in household! 2nd guess: Pressure sensor intermittently failing, so machine thinks its full of water? Causing a Go/No-go frequency which jolts the belt? 3rd guess: PCB failure? It's the intermittent nature of the problem that's stumping me. It can run fine for days, then squealing belt occurs again. I'll buy you a CRATE of beer if we can solve this one! 🙂 Thanks,
Alan
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Hi Alan!
I have come across this before, on this occasion it was a small sock That was jammed in the Gap at the front by the door seal it was not visible but with a bore scope I was able to see it and using a metal coat hanger I was able to hook it out and remove it.
There are some videos below to show you how a borescope works and also other useful videos on Bosch washing machines
if this helps i look forward to a good weekend with the beer lol
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Common questions people ask about on Bosch washing machines.
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Bosch washing machine Won´t Drain, Will not drain, doesn´t drain, does not empty – these are all pump problems, see video on this.
Bosch washing machine Will not start, won’t start, Will not open – this is usually due to the machine still having water in it or a door interlock fault, see video on this.
Bosch washing machine Will not spin, Wont spin, will not spin, doesn´t spin, fills up but the drum is not turning, won't agitate or spin - drum doesn't move!- these faults can either be motor related or pump related
Bosch washing machine Does not take conditioner, is not taking in any water.- these are all water valve related, see videos on this.
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How to Remove Items from a washing machine drum like bra wire, coins, screws
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Bosch washing machine will not spin
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How to change and replace a washing machine pump on Bosch, Neff and Siemens.
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How to replace a washing machine door seal or gasket on a Balay, Bosch, Neff or Siemens.
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How to replace washing machine drum bearings on Bosch, Neff, Siemens or Balay.
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How to replace a washing machine motor on a Bosch, Neff, Siemens or Balay
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How to fit the new element and thermostat to this Bosch, Neff or Siemens washing machine.