Roomba i3+

Model number: i355020 / 3550

Also known as: Roomba i3+, iRobot Roomba i3+, iRobot Roomba i3+ / i3 Wi-Fi Robot Vacuum — i Series — i355020 / 3550, i355020 / 3550

category

Wi-Fi robot vacuum

cleanBase

Clean Base mentioned/compatible; plus variant includes Clean Base when documented.

manualFile

Roomba_i3plus_Repair_Manual(1).pdf

navigation

Imprint Smart Mapping via floor-tracking sensors

modelNumbers

i355020 / 3550

coveredModels

iRobot Roomba i3+ EVO (models i355020 / 3550) and its sibling the i3 EVO (i315020 / 3150), Wi-Fi i-series robot vacuums.

errorCoverage

Operating errors Error 1, 2, 5, 6, 7, 9, 10, 14 and Charging Errors 1, 2, 3, 5, 6, 7, 8, 9, 10.

productFamily

i Series

runtimeMinutes

75

• iRobot Roomba i3+ Repair Manual

• Roomba i3+ Clean Base

  The Clean Base runs but the robot bin still has debris afterward, the base is louder/weaker than usual, or fine dust blows around the dock.

• Roomba i3+ Worn Battery

  Robot reports charging error 8, 9 or 10; battery won't charge or won't hold charge.

• Roomba i3+ Bin

  Robot beeps once and reports the bin is missing, even when the bin appears to be in place.

• Roomba i3+ Contacts

  Most common charging fault: robot reports charging error 5; charging is intermittent or won't start; base light may flicker.

• Roomba i3+ Bumper

  Robot beeps nine times / reports a bumper fault; thinks it is permanently bumping something and won't drive forward.

• Roomba i3+ Docking

  Robot fails to return to the dock, misses the contacts and doesn't charge, or during Recharge & Resume it docks but never goes back out to finish.

• Roomba i3+ Noise

  Robot is noticeably louder than usual — grinding, rattling or buzzing.

• Roomba i3+ Charge Circuit

  Robot reports charging error 2 or 3 and will not charge normally.

• Roomba i3+ Wi-Fi / App

  The iRobot Home app can't find or set up the robot, the robot drops off Wi-Fi, scheduled cleans don't run, or Alexa/Google voice commands stop working. The robot itself still cleans from the CLEAN button.

• Roomba i3+ Containment

  The robot drives through a doorway or into a zone a Dual Mode Virtual Wall — or an in-app Keep Out Zone — is supposed to block, or the barrier seems to do nothing.

• Roomba i3+ Navigation

  The robot wanders, repeats areas, cleans in random directions instead of neat rows, can't finish, or won't build/keep a Smart Map. The Clean Map looks broken or it returns to start without finishing.

• Roomba i3+ Drive Wheel

  Robot reports a drive fault; one wheel does not turn, robot spins or goes nowhere.

• Error 7

  Robot beeps seven times / reports a wheel problem; may turn in place or refuse to move.

• Charging Error 9

  Robot reports charging error 8, 9 or 10; battery won't charge or won't hold charge.

• Charging Error 2

  Robot reports charging error 2 or 3 and will not charge normally.

• Error 6

  Robot beeps six times, reports a cliff/drop, backs up and refuses to continue — even on flat floor, or it won't cross a dark rug.

• Error 10

  Robot reports a drive fault; one wheel does not turn, robot spins or goes nowhere.

• Charging Error 7

  Robot reports charging error 6 (too hot) or 7 (too hot/cold) and pauses charging.

• Error 14

  Robot beeps once and reports the bin is missing, even when the bin appears to be in place.

• Charging Error 8

  Robot reports charging error 8, 9 or 10; battery won't charge or won't hold charge.

• Error 9

  Robot beeps nine times / reports a bumper fault; thinks it is permanently bumping something and won't drive forward.

• Charging Error 10

  Robot reports charging error 8, 9 or 10; battery won't charge or won't hold charge.

• Charging Error 1

  On the dock or charger the robot reports the battery isn't detected / connected and won't charge.

• Charging Error 3

  Robot reports charging error 2 or 3 and will not charge normally.

• FM-12: Roomba i3+ Charging Error 6 / 7 — Battery temperature

  Symptom: Robot reports charging error 6 (too hot) or 7 (too hot/cold) and pauses charging. Likely root causes: Battery is above or below its safe charging temperature; Charging near a heat source (vent, radiator, sun); Robot just finished a long clean and the pack is warm; Very cold room / garage Next steps if owner-level checks fail: Error 6/7 appears at normal room temperature with no heat source — the battery's thermal sensor or the pack may be failing; replace the battery; if it persists, contact iRobot Customer Care 1-877-855-8593

• FM-20: Roomba i3+ Wi-Fi / app won't connect; schedule or voice fails

  Symptom: The iRobot Home app can't find or set up the robot, the robot drops off Wi-Fi, scheduled cleans don't run, or Alexa/Google voice commands stop working. The robot itself still cleans from the CLEAN button. Likely root causes: Trying to join a 5 GHz network — the i3 only supports 2.4 GHz Wi-Fi; Weak Wi-Fi signal where the Home Base sits, or router too far; Wrong Wi-Fi password, or phone not on the same 2.4 GHz network during setup; Router settings (band steering, AP/client isolation, MAC filtering, captive portal); App or robot software glitch; account/cloud outage affecting voice; Robot needs a reboot or re-pair after a router/password change Next steps if owner-level checks fail: Robot connects but repeatedly drops off — signal/router issue; relocate base or add a 2.4 GHz extender; App still can't find the robot after re-pair on a confirmed 2.4 GHz network — contact iRobot Customer Care 1-877-855-8593

• FM-21: Roomba i3+ Virtual Wall or Keep Out Zone ignored

  Symptom: The robot drives through a doorway or into a zone a Dual Mode Virtual Wall — or an in-app Keep Out Zone — is supposed to block, or the barrier seems to do nothing. Likely root causes: Weak or dead AA batteries in the Virtual Wall (most common); Virtual Wall switched off, or set to the wrong mode (Linear vs Halo); Barrier placed poorly — beam not spanning the gap, or robot starting inside the zone; Emitter window dirty or obstructed; beam blocked by furniture; Robot's IR receiver on top of the bumper dirty; App Keep Out Zone drawn in the wrong place, or the Smart Map shifted/was re-created Next steps if owner-level checks fail: Robot still crosses with fresh batteries, correct mode and good placement — the Virtual Wall emitter or the robot's IR receiver may be faulty; test with a second barrier if available, then contact iRobot Customer Care 1-877-855-8593

• FM-24: Roomba i3+ i3+ Clean Base clogged / poor evacuation

  Symptom: The Clean Base runs but the robot bin still has debris afterward, the base is louder/weaker than usual, or fine dust blows around the dock. Likely root causes: Clog in the evacuation path: robot bin port, the dock funnel/ramp opening, or the tube to the bag; Hair wrapped at the bin port so the door can't fully open; Bag full or torn (see FM-23); Large or stringy debris (socks, cords, tinsel) jamming the funnel Next steps if owner-level checks fail: Evacuation stays weak with a clear port, funnel, tube and a fresh bag — the Clean Base motor may be failing; contact iRobot Customer Care 1-877-855-8593

• FM-19: Roomba i3+ Won't map / cleans randomly / gets lost

  Symptom: The robot wanders, repeats areas, cleans in random directions instead of neat rows, can't finish, or won't build/keep a Smart Map. The Clean Map looks broken or it returns to start without finishing. Likely root causes: Dirty floor-tracking sensor on the underside (the i3 navigates by floor tracking, not a camera); Robot picked up / moved mid-clean, so it lost its place on the map; Very shiny, dark, or featureless floor the tracking sensor can't read well; Dirty cliff or wall sensors, or a stuck bumper, throwing off navigation; First runs before a Smart Map is established (early runs map as they clean); Software glitch needing a reboot; clutter the robot keeps getting tangled in Next steps if owner-level checks fail: Robot still won't drive straight rows or keeps getting lost after cleaning the sensors, remapping and a reboot — a sensor or mainboard fault is likely; contact iRobot Customer Care 1-877-855-8593

• FM-07: Roomba i3+ Error 10 — Drive wheel not turning

  Symptom: Robot reports a drive fault; one wheel does not turn, robot spins or goes nowhere. Likely root causes: Drive wheel jammed by debris; Drive motor/gearbox fault; Wheel encoder failure; Wheel module worn out Next steps if owner-level checks fail: One wheel is dead or grinds under power after cleaning — replace the drive-wheel module (aftermarket modules available) or contact iRobot Customer Care 1-877-855-8593

• FM-17: Roomba i3+ Won't power on / completely dead

  Symptom: Pressing/holding CLEAN does nothing — no lights, no sound, no movement. Likely root causes: Battery fully flat / deep-discharged; Battery disconnected or pull-tab still fitted; Charging never worked (dirty contacts / dead base — see FM-11/FM-14); Battery at end of life; Robot left off the charger for months Next steps if owner-level checks fail: Dead even with a genuine charged battery, clean contacts and a powered base — internal fault; contact iRobot Customer Care 1-877-855-8593

• FM-04: Roomba i3+ Error 6 — Cliff sensors / drop

  Symptom: Robot beeps six times, reports a cliff/drop, backs up and refuses to continue — even on flat floor, or it won't cross a dark rug. Likely root causes: Cliff sensors are dirty (dust film) and read a false drop; Robot really is at a stair edge or ledge; Very dark or high-gloss floor/rug looks like a void to the IR sensors; Robot lifted/carried while running Next steps if owner-level checks fail: Error 6 persists on clean sensors and normal flooring — a cliff sensor may have failed; contact iRobot Customer Care 1-877-855-8593

• FM-08: Roomba i3+ Error 14 — Bin not detected

  Symptom: Robot beeps once and reports the bin is missing, even when the bin appears to be in place. Likely root causes: Bin not fully seated / not clicked in; Bin contacts or robot contacts dirty; Bin latch worn; Filter installed wrong, holding the bin proud Next steps if owner-level checks fail: Error 14 persists with a properly seated, clean bin — bin-detect switch/contacts may be faulty; contact iRobot Customer Care 1-877-855-8593

• FM-01: Roomba i3+ Error 1 — “Move to a new location”

  Symptom: Robot stops, sounds the two-tone error, beeps once, and asks to be moved to a new location. Often near edges, thresholds, or after the robot climbs onto something. Likely root causes: Robot physically stuck (wedged under furniture, on a threshold, on cords or a small rug); A side wheel has dropped/hung over an edge and lost floor contact; Drive wheel can't fully retract/extend because of hair or debris; Thick tassels or a rug fringe caught underneath Next steps if owner-level checks fail: Error 1 repeats on open level floor with free wheels — a wheel drop-sensor or drive module may be faulty; contact iRobot Customer Care 1-877-855-8593

• FM-09: Roomba i3+ Charging Error 1 — Battery not detected

  Symptom: On the dock or charger the robot reports the battery isn't detected / connected and won't charge. Likely root causes: Battery not seated / loose after a replacement; Yellow plastic pull-tab still in place on a new unit; Battery contacts dirty or corroded; Battery completely flat (deep discharge) Next steps if owner-level checks fail: Battery still not detected after reseating with clean contacts — the pack is likely dead; fit a genuine iRobot replacement; A brand-new genuine battery still not detected — robot charge circuit may be faulty; contact iRobot Customer Care 1-877-855-8593

• FM-15: Roomba i3+ Weak suction / leaves debris behind

  Symptom: Robot runs normally but picks up poorly, leaves visible debris, or seems weak. Likely root causes: Bin full — the app reports bin status; High-Efficiency filter clogged; Extractors fouled with debris at the ends / under the caps; Side brush clogged, bent, or not spinning; Debris stuck in the bin intake / vacuum path Next steps if owner-level checks fail: Suction still weak after a full clean and fresh filter — vacuum motor/impeller may be failing; contact iRobot Customer Care 1-877-855-8593