I have the same slides as Mr Mark's Dynasty above. Occasionally none of the three hydraulic ones want to work and pushing the button several times gets the pump to start. I've located that solenoid below the step and when it stops working completely I'll replace it. The hydraulic one in the bedroom needs a little going out on the bottom left side so I help it with my foot... comes in fine. So, in 11 plus years I've never had a serious problem. They do not leak (slide out awning cover helps) and no wind noise... four slides are on my MUST HAVE LIST and I am NOT waiting for problems.:S