This has just happened to one of the panels on our bedroom window and one of the ones in the en-suite. A coincidence or related problem ?
Does the occurrence of condensation mean that the thermal insulation properties of the unit have been lost. Also, should the entire unit (including wooden frame) be replaced or can just the glass section be changed ?
http://www.glassonweb.com/articles/article/210/ Shows a picture and gives a few explainations on failures. You can just change the units and keep the frames, but you may need new beading if that is damaged.
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