How do I know if the seal is broken on my patio door
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Inspect it. If starting to crumble, have them reglazed.
Assuming that you mean the glazing seal, the glass will begin to turn cloudy.
is there moisture in the glass
if the rubber is gone or dangling. but this question confused me.... need more information.
Is there fog or blurriness or condensation? Those things are all telling of a broken seal.