This ultrasonic cleaner arrived with very little to go on — just that it had stopped turning on completely. As always with jobs like this, we agreed a maximum repair budget upfront before getting started, so the customer wouldn't be left out of pocket if the fault turned out to be more serious than expected.
With any device that holds liquid as part of its normal operation, that's always the first place to look — electrics and water rarely mix well. Sure enough, there were clear signs of water ingress inside the unit once we opened it up.
We ruled out a leak from the pipework, as all the fittings were sound and proved difficult to remove during dismantling. The most likely cause was the unit being drained into a sink that still had the plug in, allowing water to find its way back into the electronics. Identifying the root cause early on is hugely valuable — it can cut diagnosis time dramatically and points straight at where the damage is likely to be.
We found a blown PCB fuse, which we replaced as the first step. However, the boards showed clear signs of water damage and a couple of the capacitors had visible swelling — both signs that pointed to further issues beneath the surface.
After the fuse replacement, the unit powered up and ran normally. Unfortunately, as soon as a cleaning cycle was started, the fuse blew again immediately.
At this point we'd reached the maximum agreed repair figure, and a full circuit board refurbishment would have brought the cost close to that of a replacement unit. In this case, we had to be honest with the customer that the repair wasn't economically viable and call it a day.
Not every repair has a happy ending, but knowing when to stop is just as important as knowing how to fix something — we'd rather give straight advice than run up a bill on a lost cause. If you've got an ultrasonic cleaner giving you trouble, yours may well be a more straightforward fix.
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