I have the Aoyue Int701A++ combo soldering/desiodering station. It completely clogged internally in a few months. In my case it wasn't the desoldering gun part that clogged bu they share the same suction so I had to take it all apart to fix it. Turns out that it was mostly flux fumes from the soldering iron's fume extractor. Mine used an AC pump so I opened it up and cleaned out all the diaphragm and hoses but, somehow, it was still 100% clogged! All the internal tubing was transparent and clean so I could tell that it wasn't a blockage in the tubes. After assembling/disassembling many times I finally realized that I could not see light through the front air port when I shoupd be able too. Even though there was a filter there during operation it seems all the powdered flux residue would deposit right inside the nipple where the inner hose attaches. I jammed the back of a plastic watercolor brush in there and saw a puff of yellow powder erupt inside the clear hose. Eureaka! Suction restored.
I have the Aoyue Int701A++ combo soldering/desiodering station. It completely clogged internally in a few months. In my case it wasn't the desoldering gun part that clogged bu they share the same suction so I had to take it all apart to fix it. Turns out that it was mostly flux fumes from the soldering iron's fume extractor. Mine used an AC pump so I opened it up and cleaned out all the diaphragm and hoses but, somehow, it was still 100% clogged! All the internal tubing was transparent and clean so I could tell that it wasn't a blockage in the tubes.
After assembling/disassembling many times I finally realized that I could not see light through the front air port when I shoupd be able too. Even though there was a filter there during operation it seems all the powdered flux residue would deposit right inside the nipple where the inner hose attaches. I jammed the back of a plastic watercolor brush in there and saw a puff of yellow powder erupt inside the clear hose. Eureaka! Suction restored.