The failure of the low water indicator is a common occurrence with the EM6910.
Out of curiosity, I popped a non-working float open to see why such a simple device like a magnet in a sealed box should be so prone to failure.
Here are some photos of what I found-



As can be seen, what was once a little bar magnet sitting in its holder at the bottom of the float was now a mass of black magnetic particles clinging together in a strange shape because of their magnetism. In amongst this were a couple of larger chunks of magnet which had not yet fully decayed.
All of this re-arrangement had disrupted the magnetic field of the original bar shape, preventing it from closing the contacts in the reed switch which hides under a blob of white silicon on the control board just the other side of the plastic 'wall'.
I'm not sure if the breakdown of the magnet would have been caused by water getting in or just a poor quality magnet to start with.
Trev
Out of curiosity, I popped a non-working float open to see why such a simple device like a magnet in a sealed box should be so prone to failure.
Here are some photos of what I found-
As can be seen, what was once a little bar magnet sitting in its holder at the bottom of the float was now a mass of black magnetic particles clinging together in a strange shape because of their magnetism. In amongst this were a couple of larger chunks of magnet which had not yet fully decayed.
All of this re-arrangement had disrupted the magnetic field of the original bar shape, preventing it from closing the contacts in the reed switch which hides under a blob of white silicon on the control board just the other side of the plastic 'wall'.
I'm not sure if the breakdown of the magnet would have been caused by water getting in or just a poor quality magnet to start with.
Trev
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