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Bosch WF02467GB/01
This machine tripped the house RCD late in the washing cycle resulting in no activity at the control board. On inspection the board had blown two tracks connected to the motor circuit. I have repaired the tracks and replaced the motor brushes. The control board now functions and advances as far as the initial filling, but no activity from the motor, just a relay clicking.
On further testing of the motor I found no shorts to earth or between the six pins on the connector. However I did find that one of the brush circuits was open.There’s a component inline (see photo) which I believe could be a thermal fuse and there is no continuity across it.
My question is, am I correct in assuming this is a thermal fuse and if so can it be replaced? I believe the cause of the failure to be a build up of graphite dust from the worn brushes which caused a short on the final spin cycle, in the abscence of any other finding any other failures on the motor or the rest of the machine.
It has been suggested elsewhere that the fuse, if it is that, could be replaced with this, albeit with some level of soldering and modification – https://shop.ukwhitegoods.co.uk/1601600 … al-cut-out.
I can’t find any motor end frame listed for the motor (00144797) as an alternative and safer repair.
Thanks
Re: Bosh Motor Thermal Fuse
There is a VERY strong possibility that even if you replaced the cut out the motor would blow the circuit board again as soon as it ramps up to speed.
Re: Bosh Motor Thermal Fuse
Thanks for the confirmation and advice, I think I might give it a shot out of curiouslity, but for peace of mind and safety a new machine is the likely outcome.
Re: Bosh Motor Thermal Fuse
Thought I’d update as there’s been a successful outcome.
Once I had confirmation that a thermal fuse was the last piece of the puzzle in diagnosing the problem, closer inspection of the tacho ring located at the rear of the motor and half a centimetre from one of the protruding brush holders identified an arc spot in the tacho ring’s metal housing.
This confirmed the suspicion that the reason for the failure was due to a build up of graphite dust which caused a short to earth. This tripped the thermal fuse on the brush circuit, the house RCD and blew out a couple of PCB tracks on the control board. Must have been quite a pop to do all three.
After checking insulation resistance of the windings with a mate’s meter, just to be 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} sure, I decided to temporarily bridge the thermal fuse and run a couple of full load cycles on the machine and with success! We have a working washing machine again.
I will now replace the thermal fuse with https://shop.ukwhitegoods.co.uk/1601600-hotpoint-motor-thermal-cut-out, there will be a need for a little modification and soldering but for me that’s small beer when saving £400 quid.
This machine has been working without incident for 16 years and is otherwise in fine condition, so we’ll get a few more years out of it no doubt. On a quality machine like the Bosch Classix the lesson is to have the motor’s brushes replaced for a couple of quid before they wear down so far as to cause wider damage, saving on a whole load of hassle or the premature cost of a brand new machine.
Thanks to iadom for confirming the thermal fuse and pushing me to make sure the motor windings were good before jumping the gun.
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