iRobot Roomba i4+ Repair Manual

Troubleshoot documented Roomba i4+ operating errors, charging errors, suction, runtime, navigation, Wi-Fi/app and Clean Base issues.

• Recall Status; Technical Specifications; How It Works; Quick Diagnostic Guide; General Safety; Controls; Error Code Reference; Failure Modes FM-01 to FM-24; Parts and Maintenance Schedule

category

Wi-Fi robot vacuum

cleanBase

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

manualFile

Roomba_i4plus_Repair_Manual(1).pdf

navigation

Imprint Smart Mapping via floor-tracking sensors

modelNumbers

i455020 / 4552

coveredModels

iRobot Roomba i4+ EVO (models i455020 / 4552) and its sibling the i4 EVO (i415020 / 4150), 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

90

• Roomba i4+ Stuck / Wheel

  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.

• Roomba i4+ Extractors

  Robot stops, beeps twice / says to remove and clean the extractors. The Dual Multi-Surface rubber extractors may be stalled or struggling to turn.

• Roomba i4+ Side Wheel

  Robot beeps five times / reports a wheel fault and won't drive properly.

• Roomba i4+ Cliff Sensors

  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.

• Roomba i4+ Wheel

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

• Roomba i4+ Bumper

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

• Roomba i4+ Drive Wheel

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

• Roomba i4+ Bin

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

• Roomba i4+ Battery Not Detected

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

• Roomba i4+ Charge Circuit

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

• Roomba i4+ Contacts

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

• Roomba i4+ Battery Temp

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

• Roomba i4+ Worn Battery

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

• Roomba i4+ 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 i4+ Weak Suction

  Robot runs normally but picks up poorly, leaves visible debris, or seems weak.

• Roomba i4+ Short Runtime

  Robot used to run an hour-plus but now quits early, or returns to dock (or dies) after a short time.

• Roomba i4+ Won'T Power On

  Pressing/holding CLEAN does nothing — no lights, no sound, no movement.

• Roomba i4+ Noise

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

• Roomba i4+ 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 i4+ 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 i4+ 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 i4+ Clean Base

  On the i4+, the robot docks but the Clean Base never runs its loud evacuation, so the robot bin stays full; the app may report the bin is full or the base couldn't empty.

• Roomba i4+ Clean Base

  The app or the Clean Base indicates the dirt-disposal bag is full, or the base stops emptying and prompts you to change the bag.

• Roomba i4+ 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.

• FM-09: Roomba i4+ 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-10: Roomba i4+ Charging Error 2 / 3 — Comms / charge circuit

  Symptom: Robot reports charging error 2 or 3 and will not charge normally. Likely root causes: Battery communication fault (error 2) — needs reset or new pack; Robot's internal charging system not working (error 3); Counterfeit / incompatible battery; Repeated faults logged in the robot Next steps if owner-level checks fail: Charging Error 3 that persists with a known-good genuine battery — the robot's charging circuit is faulty and the robot may need service/replacement; contact iRobot Customer Care 1-877-855-8593

• FM-11: Roomba i4+ Charging Error 5 — Contacts / counterfeit battery

  Symptom: Most common charging fault: robot reports charging error 5; charging is intermittent or won't start; base light may flicker. Likely root causes: Dirty / oxidized charging contacts on the robot or the Home Base (most common); Counterfeit or incompatible battery; Robot not seated squarely on the base; Base not powered (its own light off) Next steps if owner-level checks fail: Error 5 continues with clean contacts, a powered base and a genuine battery — charge circuit may need service; contact iRobot Customer Care 1-877-855-8593

• FM-12: Roomba i4+ 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-13: Roomba i4+ Charging Error 8 / 9 / 10 — Worn battery

  Symptom: Robot reports charging error 8, 9 or 10; battery won't charge or won't hold charge. Likely root causes: Battery worn out from age/cycles (error 9); Cell imbalance — pack can no longer balance/charge (error 10); General battery/charging fault (error 8); Counterfeit pack Next steps if owner-level checks fail: A new genuine battery still throws error 8/9/10 — robot charging circuit fault; contact iRobot Customer Care 1-877-855-8593

• FM-01: Roomba i4+ 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-07: Roomba i4+ 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-08: Roomba i4+ 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-02: Roomba i4+ Error 2 — Clean the extractors

  Symptom: Robot stops, beeps twice / says to remove and clean the extractors. The Dual Multi-Surface rubber extractors may be stalled or struggling to turn. Likely root causes: Hair/string wound at the extractor ends or under the yellow bearing caps (still happens even on tangle-free rollers); Debris or a foreign object (sock, cord) jammed in the extractor bay; Worn or torn rubber treads, or a missing or damaged bearing cap; Extractor frame not latched after cleaning Next steps if owner-level checks fail: Extractors still stall after cleaning — replace the extractor set (~$25–$45); Extractor motor hums but rollers don't turn — gearbox/motor service; contact iRobot Customer Care 1-877-855-8593

• FM-03: Roomba i4+ Error 5 — Side wheel stuck

  Symptom: Robot beeps five times / reports a wheel fault and won't drive properly. Likely root causes: A drive (side) wheel is jammed by hair or debris; Wheel can't extend/retract on its spring; Object lodged between wheel and housing; Wheel encoder fouled by dust Next steps if owner-level checks fail: Wheel still binds or one wheel won't turn under power — drive module likely needs replacement/service; contact iRobot Customer Care 1-877-855-8593

• FM-04: Roomba i4+ 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-05: Roomba i4+ Error 7 — Wheel problem

  Symptom: Robot beeps seven times / reports a wheel problem; may turn in place or refuse to move. Likely root causes: A drive wheel won't turn freely (debris or binding); Wheel motor/gear strained; Wheel dropped and lost traction repeatedly; Carpet too thick for the wheel to drive Next steps if owner-level checks fail: A wheel grinds, is silent, or won't drive under power — drive-module service; contact iRobot Customer Care 1-877-855-8593

• FM-06: Roomba i4+ Error 9 — Bumper compressed / stuck

  Symptom: Robot beeps nine times / reports a bumper fault; thinks it is permanently bumping something and won't drive forward. Likely root causes: The front bumper is stuck pressed-in (debris in the seam); Dust/hair packed behind the bumper preventing it from springing out; Bumper physically jammed against the body Next steps if owner-level checks fail: Bumper won't spring back or Error 9 persists — bumper sensor/mechanism service; contact iRobot Customer Care 1-877-855-8593

• FM-18: Roomba i4+ Loud noise / grinding / rattling

  Symptom: Robot is noticeably louder than usual — grinding, rattling or buzzing. Likely root causes: Hair/string wrapped in an extractor or wheel; Debris loose inside the bin or rattling in the body; Worn extractor bearing or end-cap; Object lodged in the vacuum path or fan; Worn drive-wheel module Next steps if owner-level checks fail: Grinding continues after clearing extractors, wheels and bin — a motor or drive bearing may be worn; contact iRobot Customer Care 1-877-855-8593

• FM-16: Roomba i4+ Short runtime / dies before finishing

  Symptom: Robot used to run an hour-plus but now quits early, or returns to dock (or dies) after a short time. Likely root causes: Aging lithium-ion battery losing capacity (most common over time); Heavy carpet load drawing more power; Clogged High-Efficiency filter / debris on the extractors making the motor work harder; Battery never fully charging (dirty contacts — see FM-11); Counterfeit battery with overstated capacity Next steps if owner-level checks fail: Brand-new genuine battery still gives short runtime — charging circuit or motor draw issue; contact iRobot Customer Care 1-877-855-8593

• FM-21: Roomba i4+ 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-15: Roomba i4+ 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

• FM-20: Roomba i4+ 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 i4 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-14: Roomba i4+ Won't dock / Recharge & Resume not finishing

  Symptom: 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. Likely root causes: Dock in a poor spot (corner, under furniture, on carpet, too close to walls); IR docking beam blocked by furniture or strong sunlight; Charging contacts dirty (robot or dock); Dock unplugged / on a switched outlet; Battery too low or worn to navigate home / complete resume; Robot lost its place on the map (moved or picked up) so it can't resume Next steps if owner-level checks fail: Robot sees the dock but never seats on the contacts — check contact alignment/wear; if the IR receiver is suspect, contact iRobot Customer Care 1-877-855-8593

• FM-19: Roomba i4+ 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 i4 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-17: Roomba i4+ 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-23: Roomba i4+ i4+ Clean Base bag full / replace the bag

  Symptom: The app or the Clean Base indicates the dirt-disposal bag is full, or the base stops emptying and prompts you to change the bag. Likely root causes: The enclosed dirt-disposal bag is full (normal after ~30–60 days depending on use); Bag not fully seated, or the lid not closed, so the base reads it as missing/full; Non-genuine bag without the detection tab Next steps if owner-level checks fail: Base still reports “bag full” or “no bag” with a correctly seated genuine bag — the bag-detect sensor or lid switch may be faulty; contact iRobot Customer Care 1-877-855-8593

• FM-24: Roomba i4+ i4+ 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-22: Roomba i4+ i4+ Clean Base won't empty the robot

  Symptom: On the i4+, the robot docks but the Clean Base never runs its loud evacuation, so the robot bin stays full; the app may report the bin is full or the base couldn't empty. Likely root causes: Robot not seated squarely on the Clean Base contacts; Clean Base dirt-disposal bag full or not seated (see FM-23); Evacuation port in the BOTTOM of the robot bin blocked by hair/debris; Clean Base evacuation tube / dock funnel clogged (see FM-24); Clean Base unplugged or on a switched/dead outlet; Bag not detecting (lid not fully closed, or a non-genuine bag without the sensor tab) Next steps if owner-level checks fail: Base still won't run the evacuation motor with power, a good bag, a clear port and a square dock — the Clean Base motor or sensor may be faulty; contact iRobot Customer Care 1-877-855-8593

• root cause analysis
• tools needed
• step-by-step repair procedure
• diagrams
• exploded views
• post-repair checks

Public pages show a preview only. Purchase the full manual to download complete repair steps, diagrams, and verification procedures.