Robot Mower Error Codes: How to Read Any Brand's Alerts

Reading an Alert Before You Know the Brand's Specific Codes

Every robot mower brand phrases its alerts a little differently, but the underlying categories are remarkably consistent — and you don't need to know your brand's exact code table to figure out roughly what's wrong and whether it's urgent. This guide covers the patterns that hold across brands, then points you to the brand-specific guide for the exact wording and numbered codes your model actually uses.

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Try This First (2 Minutes)

• Note whether the light or icon is solid, slow-blinking, or fast-blinking — these usually map to different severity levels even before you read any text
• Check whether the alert is a hard stop (mower won't move) or a soft delay (mower is just waiting)
• Count a beep pattern if your model uses one, and check whether it repeats once or continuously
• Read the exact on-screen or in-app text if your model has a display — this is always more reliable than guessing from a light color alone

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Solid vs. Blinking Indicator Lights (General Pattern)

Across most brands, a solid indicator light on the mower or base station generally means "working as expected," while a blinking or off light points to a fault in that specific system.

How to Read It:

1. Identify which specific light is blinking — charging, perimeter/wire, or a general system light — since they're usually separate indicators
2. A charging light that's off or blinking almost always points to a contacts, alignment, or power-supply issue — see our universal won't-charge guide
3. A perimeter or loop light that's off or blinking almost always points to a boundary wire fault — see our universal boundary-wire troubleshooting coverage under navigation issues
4. A general fault light with no other context usually clears with a simple power cycle before you assume a deeper issue

Time: 5 minutes to categorize | Cost: Free | Difficulty: Easy

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Beep Pattern Alerts (General Pattern)

Brands that don't have a full display often communicate through beep count or pattern instead.

How to Read It:

1. Count the number of beeps in one cycle rather than reacting to the first beep alone
2. A single, non-repeating beep is usually a minor status confirmation, not a fault
3. A repeating pattern that continues until you intervene usually means the mower is waiting for a decision it can't make on its own — check its physical position first
4. Check your specific model's manual for its exact beep-to-meaning table, since this varies by brand more than light colors do

Time: 5 minutes | Cost: Free | Difficulty: Easy

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Fix 1: Tilt or Lift Sensor Alert (Works Around 25% of the Time Across Brands)

This is one of the most universally consistent alert categories — nearly every robot mower cuts blade power immediately if it senses the chassis lifted or tilted past a safe angle.

Safety note: Power off the mower and disconnect the battery before inspecting underneath the chassis.

How to Fix:

1. Check the mowing area for steep dips or slopes near where the alert triggered
2. Clean the sensor housing of mud or grass buildup, which commonly causes false triggers on otherwise flat ground
3. Restart and watch the first pass over the affected spot

Time: 10-15 minutes | Cost: Free | Success Rate: ~25% | Difficulty: Easy

If this doesn't work: Move to Fix 2 if the alert instead relates to weather.

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Fix 2: Rain or Weather Delay Alert (Works Around 20% of the Time Across Brands)

This usually isn't a fault at all — most brands deliberately pause mowing during and after rain.

How to Fix:

1. Check the app or display for a delay status before assuming a hardware problem
2. Confirm the rain sensor itself isn't dirty, which can cause false triggers on a dry day
3. Clean the sensor and let the delay clear naturally

Time: 5-10 minutes | Cost: Free | Success Rate: ~20% | Difficulty: Easy

If this doesn't work: Move to Fix 3 if the alert mentions an obstacle or collision.

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Fix 3: Obstacle or Collision Alert (Works Around 15% of the Time Across Brands)

How to Fix:

1. Check the bumper and any obstacle sensors for physical obstruction or debris
2. Press the bumper by hand to confirm it springs back freely
3. Restart and watch the mower navigate around a known obstacle

Time: 5-10 minutes | Cost: Free | Success Rate: ~15% | Difficulty: Easy

If this doesn't work: Move to Fix 4 if the alert relates to a pending firmware update.

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Fix 4: Firmware Update or Recovery Mode Alert (Works Around 15% of the Time Across Brands)

How to Fix:

1. Place the mower in the dock if it isn't already there
2. Keep the companion app open on your phone during the update
3. Wait for the update to fully complete before attempting a normal start

Time: 10-20 minutes | Cost: Free | Success Rate: ~15% | Difficulty: Easy

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Fix 5: A Message You Genuinely Can't Categorize (Works Around 10% of the Time)

How to Fix:

1. Search your specific model's official support page or printed manual for the exact text
2. Check whether the issue started after a specific event — a firmware update, a storm, or landscaping work — since that context often narrows it down fast
3. If it's a numbered code, check your brand's dedicated error-code guide on this site if one exists, since several brands' codes are documented in full there

Time: 10-15 minutes | Cost: Free | Difficulty: Easy

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When DIY Won't Work - Repair vs Replace

Signs it's time for professional service:

• A tilt, collision, or sensor-based alert keeps triggering on flat, obstruction-free ground with a clean sensor
• A firmware update repeatedly fails to complete despite a stable dock connection
• Any alert that doesn't match a category here or in your model's manual, and persists after a full power cycle

Cost comparison: Everything above is free to check yourself. A dealer or manufacturer support diagnostic for a suspected sensor or control board fault typically runs $60-120 depending on brand.

Warranty check: A confirmed hardware fault behind a persistent alert is generally covered if the mower is still within its warranty period.

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Prevent Future Alerts

• Clean tilt, rain, and obstacle sensors on a regular schedule rather than waiting for a false trigger
• Clear the mowing area of loose debris before scheduled cycles
• Keep firmware current across every model you own
• Check your app's alert history periodically so recurring patterns show up before a full stoppage
• Bookmark your specific brand's dedicated error-code guide for exact wording once you've identified the general category here

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FAQ

Do all robot mower brands use numbered error codes?

No — some brands (Husqvarna, Greenworks) use numbered codes with dedicated tables, while others (Robomow, Segway, Gardena, Ambrogio) communicate through plain-text messages or beep patterns instead. Check your brand's dedicated guide for the exact format.

Is a blinking light always worse than a solid one?

Generally yes for the same indicator — solid usually means normal operation, while blinking or off usually flags a fault in that specific system. This holds across nearly every brand.

My mower beeps repeatedly and won't stop. What does that mean?

A continuous repeating beep pattern (as opposed to a single confirmation beep) usually means the mower is stuck waiting for a decision it can't make alone — check its physical position and surroundings first.

Is a rain delay message something I should worry about?

No, it's a deliberate feature on nearly every brand. It's only worth troubleshooting if the sensor seems to trigger falsely on dry days.

Where do I find my specific brand's exact error code meanings?

Check this site's dedicated error-code guide for your brand if one exists — Husqvarna, Worx, Robomow, Segway, Gardena, Greenworks, Yard Force, and Ambrogio each have one covering their specific wording and numbering.

Are alert-triggered faults covered under warranty?

A confirmed hardware fault behind a persistent alert is typically covered within the warranty period across all brands. Environmental false triggers (terrain, debris, weather) generally aren't.