- Garden
- Cordless garden tools
Solid red light
Greenworks Solid red light on charger: temperature pause
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
When a Greenworks battery charger displays a Solid red light as you engage the battery, it typically indicates that the battery is at the wrong temperature to be charged and needs to rest indoors at room temperature.
Safety first
Stop and check this first
- If the machine stops because the operating temperature is too high or the charger shows a solid red light, always remove the safety key and battery pack, never open the housing, and allow the battery and charger to rest indoors in a cool, dry place.
Safe checks you can perform
- Remove a recently used battery from the charger and let it cool down completely
- Allow both the battery and charger to rest indoors at room temperature
- Leave the charger unplugged when not in use and inspect for physical damage
Leave these tasks to a qualified professional
- Do not attempt this professional task: Room-temperature check of the battery pack and charger at an approved Greenworks service center
- Do not attempt this professional task: Replacement of the damaged or faulty battery pack or charger with an approved part
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Room-temperature check of the battery pack and charger at an approved Greenworks service center
What they doIf the solid red light stays on even after the battery and charger have rested indoors at room temperature, an approved Greenworks service center tests both units to determine which one is blocking the charge.
They must show youthe room-temperature cross-test confirming whether your battery pack or your charger holds the solid red light.
In writingthe approved service center report stating which unit is affected and its coverage under the Greenworks warranty (3 years on the product and 2 years on consumer batteries).
Replacement of the damaged or faulty battery pack or charger with an approved part
What they doThe affected battery pack (such as G40B2, G40B4, G40B6 / BAF series) or charger (such as G40C / CAF series) is replaced with an approved Greenworks replacement unit without opening the casing.
They must show youthe approved replacement battery or charger initiating a normal charge at room temperature.
In writingthe replacement or warranty documentation recording the exact model number of the replaced battery pack or charger.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Remove a recently used battery from the charger and let it cool down completely
- Who:
- you, right after finishing work with your garden tool.
- How:
- if the battery was recently in use, remove it from the charger and allow it to cool down completely in a dry, cool indoor room-temperature location prior to charging.
- Result that matters:
- the battery pack cools down from recent tool discharge before a new charging attempt.
- If charging starts normally once cooled down:
- post-use warmth was the cause of the stop.
- If the solid red light remains on:
- allow both the battery and charger to rest longer indoors at room temperature.
- Evidence to keep:
- cooling time indoors between finishing tool use and attempting to charge the battery again.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Greenworks Batteries and Chargers Official Care and Troubleshooting Guide
Allow both the battery and charger to rest indoors at room temperature
- Who:
- you, moving both units into a dry, cool indoor room.
- How:
- bring the battery and charger indoors to a cool, dry room-temperature location away from direct sunlight, wait until they are no longer hot or cold, and attempt charging again.
- Result that matters:
- once both the battery and charger are at room temperature, the solid red light clears and normal charging begins.
- If charging proceeds normally after resting at room temperature:
- store batteries indoors in a dry and cool location.
- If the solid red light stays on at room temperature:
- check for housing damage and unplug the charger between uses.
- Evidence to keep:
- location where the battery and charger were kept before moving them indoors to room temperature.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Greenworks Batteries and Chargers Official Care and Troubleshooting Guide
Leave the charger unplugged when not in use and inspect for physical damage
- Who:
- you, with the charger unplugged from the wall outlet.
- How:
- leave the charger unplugged from the outlet and the battery disconnected from the charger when not charging (which allows the charger to reset itself between uses), and verify that neither the battery pack nor the charger is damaged.
- Result that matters:
- the charger resets itself cleanly prior to your next room-temperature charging attempt.
- If reconnecting the charger and engaging the room-temperature battery starts charging:
- the issue is resolved.
- If the solid red light persists at room temperature or either unit is damaged:
- contact an approved Greenworks service center.
- Evidence to keep:
- photo of the charger displaying the solid red light and the model label on the battery pack.
Evidence: Greenworks Batteries and Chargers Official Care and Troubleshooting Guide · Manual del operario y Operator Manual Greenworks 40V GD40LM46SP / GD40LM46SPK6 (LMF412)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Garden
- Brand
- Greenworks
- Product type
- Cordless garden tools
Known code variants
- Charger solid red light
- LED rojo fijo en cargador
- Luz roja fija en cargador
- Solid red LED on charger
- Solid red light
- Temperatura incorrecta de carga
- Wrong battery temperature to charge
What it means
Greenworks official charger and battery documentation (Greenworks Battery Chargers FAQ and Batteries & Chargers Care Guide, together with the EU 40V GD40LM46SP Operator Manual for G40B2, G40B4, G40B6 / BAF series batteries and G40C / CAF series chargers) states that a solid red light on the charger when you engage your battery typically indicates that the battery is at the wrong temperature to be charged, so you should allow the battery and charger to rest indoors at room temperature until they are no longer hot or cold. Other 24V, 40V, 60V, or 80V models may vary, and a solid red light alone never proves a part is faulty.
Warnings and stop conditions
- Higheditorial warning
If the machine stops because the operating temperature is too high or the charger shows a solid red light, always remove the safety key and battery pack, never open the housing, and allow the battery and charger to rest indoors in a cool, dry place.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Greenworks Batteries and Chargers Official Care and Troubleshooting Guide · Manual del operario y Operator Manual Greenworks 40V GD40LM46SP / GD40LM46SPK6 (LMF412)
Symptoms and causes
Probable causes · in order
- Battery placed on the charger right after use before cooling down completelyCommon
Greenworks battery care guidance states that if a battery was recently in use, you must allow it to cool down completely prior to charging; engaging a still-warm battery triggers the solid red light for wrong charging temperature.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Greenworks Batteries and Chargers Official Care and Troubleshooting Guide
- Battery or charger too warm or too cold due to storage or charging environmentPossible
Storing or attempting to charge the battery outside a cool, dry indoor location away from direct sunlight leaves the battery at the wrong temperature to be charged and triggers the solid red light.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Greenworks Batteries and Chargers Official Care and Troubleshooting Guide
- Persistent issue in the battery pack or charger after resting at room temperatureLess common
If both the battery and charger have rested indoors at room temperature until they are no longer hot or cold and the solid red light still does not clear when attempting to charge again, one of the units requires service or replacement.
Evidence: Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs · Manual del operario y Operator Manual Greenworks 40V GD40LM46SP / GD40LM46SPK6 (LMF412)
Virtual technician
Does Solid red light still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Greenworks Battery Chargers Collection and Official Charger Troubleshooting FAQs
Greenworks Tools · 2026 · official_doc
- 2
Greenworks Batteries and Chargers Official Care and Troubleshooting Guide
Greenworks Tools · 2026 · official_doc
- 3
Manual del operario y Operator Manual Greenworks 40V GD40LM46SP / GD40LM46SPK6 (LMF412)
Greenworks Tools · 2021 · official_doc
Was this entry useful?