Might be running dry due to poor design of the plumbing, or run while pool drained.
It occurs to me to ask whether you are certain that they really are 32mA, which seems like an extraordinarily low rating for fuses in electrical (as opposed to electronic) equipment? If you still have any intact ones (or can remember) is the fuse wire within the glass fuse visible to the naked eye?
Indeed. As I implied, such small fuses would not be uncommon in electronic equipement - but would be, to say the least, surprisingly low for 'electrical' equipment. If they really are 32mA, I suspect they must relate to electronic bits within the electrical equipment.
We had a seized and burnt-out 3-phase pump a couple of months back in our pool plant, and we had to wait 4 weeks for him to come out and say we needed a new one. I questioned this as his answer is always to just replace the units which is fine if you've got an indefinite budget, but at £500 per pump (we've had 5 over the last 6 months! Although to be fair, two were replaced under warranty.) it just strikes me as a bit of a joke as they're generally fully serviceable.
We've tried using a different contractor who claim they use local engineers, but again we found ourselves waiting for weeks because the engineer had to come up to Northumberland from Surrey or Hampshire, somewhere that way anyway. Our other option, the GM won't even consider because he had issues with them at a previous hotel he worked at.
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