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Adjustments, seals and leaks on in-wall rooms

An in-wall room has no stop cans or stop bolts to set. It stops where the motors stall at the end of travel, so seal fit, rollers, rack alignment and clean racks are the adjustments, and the stall threshold on C1 and C2 boards is the only setting.

The short version

Where the room stops

Lippert's in-wall manuals give no stop cans, stop bolts or limit switches. The controller runs each motor until it stalls at the end of travel, which is why owners are told to keep holding the switch a few seconds until the motors shut off. The seals take up the end of the stroke, so seal condition and fit decide how tight the room closes.

On C1 and C2 boards the stall threshold is adjustable. Lippert allows it only when the room is clear, voltage is good (12 V), and the room still stalls mid-stroke. Raise it only as much as needed: Lippert says higher settings shorten system life.

  1. Press the mode button four times quickly, then hold the fifth press about 5 seconds.
  2. The red LED starts to flash.
  3. Break the seal on the cover over the stall force calibration hole.
  4. Turn the potentiometer below it with a small screwdriver: clockwise for more stall force, counterclockwise for less.
  5. Press the mode button to save. Both LEDs light and the board returns to auto mode.

Lippert's tolerance check

Lippert's visual inspection and variance forms (QR-085A, B for Winnebago, C metric, D) are the closest thing to an alignment spec for an in-wall room. They're also what Lippert and the RV makers ask for on warranty claims, so fill one in before and after any repair.

CheckSpec
Outside edge of column to face of gear rack2-1/2 in, plus or minus 1/8 in, at all 4 corners, fully extended and 3 in from fully retracted
Rack to rackParallel, less than 1/8 in difference
Seal engagementNo binding, 1/4 in nominal overlap
Gear racksNo damage, screws flush
Non-standard installsUse the RV maker's measurements

Height, rollers and racks

Lippert's in-wall service documents don't give a room height or level adjustment like a through-frame room has. The room's position comes from where the racks are screwed to it and where the columns sit in the opening. For rooms built to be adjustable, Lippert has a separate document, TI-291 (modifying an in-wall system for an adjustable slide); get it before you change anything.

What you can check is how the room is carried. Floor rollers should be engaged under the room floor, not digging into it and not spinning free beneath it. V-rollers should be clear and undamaged. Rack screws should sit flush and not catch the seals.

What causes binding

Binding shows up as one side stalling, code 5, or a room that stops short and loses sync. Lippert's lists point to the same handful of causes every time.

Seals, leaks and cleaning

The exterior bulb seal on the T-molding wraps the rack ends, a bulb seal on the column covers the motor retention screw, and the interior wipe seal is glued to the H-column with fast-bonding adhesive. The H-column itself is sealed to the sidewall with a bead of OEM-recommended sealant down its whole inside edge, and the rack ends are closed with flat back rack plugs (Lippert part 318803).

For a leak, check that column sealant bead, the bulb and wipe seals at that corner, and the rack end plugs. Jayco's TSB 23-100 (2023 Starcraft Super Lite) fixed a slide leak with a larger exterior bulb seal plus a bead of sealant along the top of the wall. Lippert also has a water intrusion document, QR-102, for in-wall rooms. Reseal per the RV maker after any column work.

Lippert says no grease or lubricant is needed on an in-wall system, and that lubricants can hurt long-term reliability. In salt or ice, keep the racks and seals clean with mild soap and water, and clear the racks with compressed air or a dry brush before running the room.

On the job

  1. Run the room both ways and note where it stalls: mid-stroke or at the ends.
  2. Outside: folded flap seals, debris on the room top. Inside: carpet, seals caught in rollers.
  3. Inspect the racks: screws flush, no shavings, no gouges. Blow out with air or brush, no lube.
  4. Check floor rollers and V-rollers.
  5. Measure the four corners and parallel and record them on the QR-085 form.
  6. Only if clear, at 12 V and still stalling mid-stroke: raise the stall force a little (C1 and C2).
  7. Leaks: column sealant, bulb and wipe seals, rack end plugs, then reseal per the RV maker.

Numbers

Shop tip

If the customer has sprayed the racks, clean them before you diagnose anything. Lippert wants nothing on them, and the dirt that sticks to lube is what ends up jamming the spur gears.

Where this comes from