Some things to check if your slideout won’t retract (or extend):
- Is the ignition on? (for Sprinters, you should actually start the engine to turn off the glow plugs, rather than just turning on accessories)
- Is the parking brake on?
- Are the coach batteries connected (In-use mode, not set to storage mode)?
- Is the slider key turned on?
- Is the slider button pushed? Are you pushing it the right direction? If it is buzzing, then you are going the wrong way.
If your slideout still won’t retract: Check the hydraulic pump motor, usually behind the coach entrance step. Is the power lead from the battery to the hydraulic pump motor making good contact?