I have one of these sanidry units http://www.basementsystems.com/dehumidifier.html
that supposedly retail for over $1700. I would never spend that on a DE-humidifier, it came with the house when I purchased it. In summer 2010 I noticed it wasn't producing any condensate, so I took it too the company to avoid the service call fee for trouble shooting, they could not find the problem and just recharged it for $100. It worked somewhat last summer and at the beginning of this summer I noticed an evaporator cylinder on the unit had frost on it so I assumed it was still working. Sunday I popped the cover off and noticed the compressor was too hot to touch and the cylinder that had frost on it was hardly cold.
The company says the only thing on the unit under warranty is the compressor, everything else is only 30 months. I don't know very much about AC systems, but wherever the leak is it must be only leaking when the unit runs. When AC systems are charged, is the pressure is greater than an atmosphere?
This unit is a 1 ton system, I figure I pretty much have no hope at finding the leak myself with an air compressor and soapy water since it is only leaking while the thing runs. The company said they would diagnose it and stop if its going to be more than $500 to fix. Seeing as they couldn't find the problem last time I don't have too much faith.
Anyone have any clever techniques for finding leaks in one of these? thanks