If your pump is running you must have a blockage in the pipe between the drum and the filter, or the pump and the outlet hose check also for a coin jammed in the pump spouts, or if your drain hose is connected to the sink a blockage at the sink connection, can be grease backed up into the drain hose. I would go for the sink first. Also if machine has an anti syphon box top rear panel could be blocked. Cheers..
Kenjo
February 2013