“just installed” Check where the end of the outlet pipe goes-so if plumbed out via a under the sink plumbing nozzle make sure the spout blanking has been cut off OR that there is no bung (usually a light blue plastic bung) where the nozzle is screwed just above the U bend area. Sounds to me like it is not pumping out so when the machine goofs up does the machine still have water in it? What happens if you set the machine on drain / spin only?
Just a thought!