E04 not draining

I have a exxcel 1400 express its showing e04 i have taken all hoses off and flushed them all out and cleaned out the pump checked the u bend and that the clip is not done up 2 tight! still not draining and still showing e04 help please b4 i take a sledgehammer 2 it

Check your exit hose spigot, it may be clogged. This is if your filter is all 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. Snaking out your standpipe would be good too.

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