When your vacuum wanders aimlessly around the room looking for its home, approaches the base only to veer away at the last second, or mounts the ramp without charging, it's almost always an optical homing signal issue or dirty contact pins. Here is how to guide it back on track.
Interactive Symptom Path Finder
Select what your vacuum is doing right now to jump straight to the exact step:
Clean Both Sets of Metallic Charging Contacts
Key Action: Remove non-conductive floor grime and oxidation film
A thin, invisible film of floor wax, pet dander, or dust coats the spring-loaded charging pads. This creates high electrical resistance: the robot physically touches the metal but cannot detect charging voltage.
Action Checklist:
- Unplug the dock from the wall outlet.
- Wipe the metal charging contact plates on the underside of the robot with a dry microfibre cloth or dry melamine sponge (Magic Eraser).
- Clean the matching spring pins on the dock base.
Never use steel wool or harsh metal abrasives—they scratch off the nickel plating and accelerate rusting.
Ensure the Robot Approaches Squarely
Key Action: Check wheel tread traction and dock ramp alignment
If the robot drives onto the dock ramp at a 5-degree angle, one contact misses its pin. Worn rubber tire treads or dust on the plastic ramp reduce wheel grip.
Action Checklist:
- Wipe down the rubber drive wheels with a damp cloth to restore grip.
- Wipe any dust off the dock's textured plastic approach ramp.
Clear the 1.5m Runway Zone Around the Base
Key Action: Provide uninterrupted navigational approach space
Docks require clear approach clearance so the robot can perform its 180-degree alignment pirouette before backing or pulling onto the pins.
Action Checklist:
- Maintain at least 0.5 m of clearance on the left and right sides of the base.
- Keep at least 1.5 m of open floor directly in front of the ramp.
- Ensure thick rug edges don't sit within 1 metre of the dock entrance.
Eliminate Infrared Reflection Traps
Key Action: Stop mirrors and glass from bouncing the homing beacon
The dock emits an infrared homing beacon (like a lighthouse) that guides the robot into position. Highly polished chrome kickboards, full-length mirrors, or glossy dark floor tiles bounce this light and produce duplicate phantom signals.
Action Checklist:
- Inspect the line of sight in front of the dock.
- If a mirror or reflective glass cabinet faces the base, reposition the dock or apply a piece of matte tape along the bottom 10 cm of the reflective surface.
Rebuild Map If Dock Was Recently Relocated
Key Action: Sync base coordinates with robot localization data
If you move the dock to a new outlet even 2 metres away, the robot still attempts to navigate to the old remembered GPS coordinate on its map.
Action Checklist:
- Delete the existing map or run a fresh "Quick Mapping" pass starting from the new dock location.
Verify Dock Power Supply & Outlet Operation
Key Action: Confirm the base station is live and transmitting its beacon
An unpowered dock produces no infrared homing signal and zero charging voltage. The robot will approach, bump into it, and wander off in confusion.
Action Checklist:
- Verify the indicator LED on the base station is illuminated.
- Test the wall outlet with a lamp or phone charger to ensure the breaker hasn't tripped.
| Symptom | Root Cause | Fast Fix |
|---|---|---|
| Mounts dock but light stays off | Dirty contact plates | Wipe with dry microfibre / Magic Eraser |
| Circles in front of dock repeatedly | Reflective surface / mirror | Cover reflective baseboards or move dock |
| Drives onto ramp at an angle | Slippery wheels / ramp dust | Clean rubber tire treads and textured ramp |
| Wanders in other rooms when low | Moved dock location | Start run from dock and rebuild map |
FAQ Troubleshooting Answers
Frequently Asked Questions
My robot vacuum touches the dock but the charging light never comes on — what is wrong?
Almost always oxidation or a thin film of dust on the charging pads. Clean both sets of contacts firmly with a dry microfibre cloth.
Can a dark carpet or rug stop my robot from docking?
Yes! The cliff sensors on the underside of the robot can mistake dark black carpet near the dock for an open drop/staircase, refusing to cross over it.