This usually happens when the seal around the edge of the units has failed. Yes you would need to replace the unit. Do you still have a warranty for them? how old are the units?
No I don,t have a warranty on them they are about 6 years old. the units are in a hardwood frame and sealed in with a bit of silicon. if I replace the units do i still use silicon to seal them in place or is there something more suited to hardwood frames.
cheers
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