Siemens IQ300 washing machine error f43
Hello,
2 nights ago our electric was tripped, when switching it back on the washing machine was flashing with an error code f43.
After searching I decided to change the motors carbon brushes. The old ones were very low, with one of them very dull and slightly discoloured due to burning (im guessing).
Anyway, I changed the brushes, reset the machine, and tried a wash. But the motor still does not turn, I tried resetting over again but nothing.
I let the new load run through the cycle only to end up with an f43 code again towards the end.
Does anyone know what the issue may be? Have I forgotten to do something else? And are there fuses within the washing machine?
Thanks
William
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Siemens IQ300 washing machine F43 with motor not turning after brush replacement
- The problem
- The washing machine tripped the electrics and then showed F43. The motor would not turn. The carbon brushes were replaced because the old ones were very worn and one appeared heat-discoloured, but the machine still completed a cycle attempt and ended with F43 again.
- Likely cause
- Most strongly supported diagnosis is a motor circuit fault rather than just worn brushes. The accepted advice was to check motor continuity and confirm the new brushes had been released properly and were making contact with the commutator. Because the appliance had tripped the supply, damage to the PCB was also suggested as possible, but this was not confirmed.
- What fixed it
- Recommended action was to check continuity on the motor, verify both brushes were free in their holders and touching the commutator, and inspect the motor plug, socket and terminal tags. It was also explained that the tacho coil wires may appear open circuit on a basic continuity setting and may need a higher resistance range to read. Exact repair was not confirmed in the discussion.
- Checks to try
- Checked that the replacement carbon brushes were touching the commutator
- Advised to check motor continuity
- Advised to ensure the carbon brushes had been released from their holders
- Advised to inspect the motor plug, motor socket and terminal tags
- Motor terminals were tested and only the first two and last three gave a reading; middle terminals appeared blank
- Explained that the two thin tacho coil wires can appear open circuit on a normal continuity setting and may read on a higher range at about 200 Ohms
- PCB damage was suggested as a possibility because the machine had tripped the electrics
- Parts or tools mentioned
- Motor carbon brushes
- Continuity meter
- Specialist insulation test meter
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
8 Answers
If the motor isn't running the first thing that needs checking is the continuity on the motor. Make sure you've released the carbon brushed from their holders and they are both touching the commutator.
If it fused the washing machine it's possible something else got damaged, maybe in the pcb. It should also be tested for low continuity but you need a specialist insulation test meter.
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I found this site that explains how to test the motor, would you suggest I do this?
youtube.com/watch?v=D5Aw7CBEGPI
Hello! I did check that the brushes were touching and they are. I think my next step is to test the motor as detailed in the video I posted in my previous post/reply.
Yes, and make sure the motor plug is in properly and all the tags inside it and the motor socket it connects to are OK.
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I have tested the meter, the only terminals that offer a reading are the first two and last three (in any order). All the middle ones come back blank.
Any ideas what that may mean?
Are they the 2 thin red wires that don't get a reading?
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I'm unable to see as it looks like an enclosed unit. I'll have to take the motor apart. I'll try and find a diagram for the motor.
So if it is the two red wires, does that mean it's a dead motor?
You can usually see where the wires go to at the bottom of the pins. There's usually two thin red wires that go from the small coil at the end of the motor to two of the pins.
On a washing machine motor with carbon brushes there's usually 2 pins that test the carbon brushes. One to each brush. Then 3 pins that go to the field coil. You should get a good reading from them all.
The last 2 pins are the two thin wires that go to the tacho coil. This coil has a very long thin wire and therefore has a very high resistance. It can appear open circuit on normal continuity meter setting. If your meter has a higher range setting you may be able to get a reading from it. If I remember right it's about 200 Ohms.
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