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The light is on as the unit won't drain or is unable to drain due to blockage in the drain hose. This problem usually occurs due to clogged/blocked drain hose or the drain pump not working. First try to clean the drain hose and drain pump filter for any clogs, then check drain pump operation. If the problem returns after cleaning then it is the drain pump that needs replacement. Please get back to me if you have any other questions.
Kevin
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