Lippert Slide-Out: “4 red flashes”
warning RV slide-out error codes
What it means
High battery / over-voltage fault. The controller saw supply voltage above roughly 18 volts and shut down to protect itself.
Most likely causes
- Charging or converter malfunction pushing voltage too high most likely
- Improper jump-start, wrong charger, or external power source feeding excessive voltage common
- Voltage spike during operation less common
Safe checks you can do yourself
- Measure system voltage at the battery; over ~15V sustained is abnormal for a 12V system.
- Disconnect any auxiliary chargers or boosters and retest.
- Inspect the converter/charger output if voltage reads high.
How to reset / clear 4 red flashes
- Remove the over-voltage source and bring the system back to normal 12V.
- Energize the extend/retract switch once to reset the controller.
- Energize the switch again for normal operation.
When to call a technician
If you cannot find the source of the high voltage, or the converter/charger output reads high, have the charging system inspected before further use.
Applies to
Schwintek In-Wall slide-out controller (Rev B and later) · Lippert OneControl-managed Schwintek slide systems
FAQ
What does Lippert Slide-Out code "4 red flashes" mean?
High battery / over-voltage fault. The controller saw supply voltage above roughly 18 volts and shut down to protect itself.
How do I reset Lippert Slide-Out 4 red flashes?
Remove the over-voltage source and bring the system back to normal 12V. Energize the extend/retract switch once to reset the controller. Energize the switch again for normal operation.
What is the most common cause of 4 red flashes on a Lippert Slide-Out?
The most likely cause is charging or converter malfunction pushing voltage too high.
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Sources
- Schwintek In-Wall Slideout System Operation and Service Manual — Error codes section, code 4: High battery, voltage greater than 18 volts (Lippert Components, Inc.)
- Schwintek In-Wall Slideout Troubleshooting and Component Replacement — Red LED 4 Blinks: High Battery (RV Upgrade Store (Lippert document))
Note: The 18V threshold is per the Lippert manual; some controller revisions may differ slightly.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.