As 3'senough suggests, if you have the schwinteck system and odds are you do then I recommend you check under the bed for the control boards (there will be 2 of them 1 for dinette slide 1 for bedroom slide). We have an 2011 model and that's where ours are located. Also as 3's suggests check the connections that power the control modules. If they are securely connected check the wiring connections going into the bottom of the control modules. If all connections are secure, and slide is still not functioning properly there is instruction on the front of the module that will direct you to depress a button (similar to a reset button) for a few seconds and lights will flas as 3's has suggested and will coorelate to a code describing the error condition. There is also an override option using that is noted as well. hope this helps.
Kettrell & Sharon