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Check your exit hose spigot, it may be clogged. This is if your filter is all clean (refer manual as to how to clean). There should be air for passage in the standpipe behind. Your hose should not fit airtight into the standpipe and neither too deep into it (4 to 6 inches maximum). Snaking out your standpipe would be good too. And try some WD40 on the door lock
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