- Garden
- Cordless garden tools
Red and green LED flashing
Einhell Red and green LED flashing on GE-CT 18/28 Li: fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
In the charger indicator table of the Einhell GE-CT 18/28 Li manual (Art.-No. 34.112.42, I.-No. 21024, section 12), the row Red LED: Flashing and Green LED: Flashing means Fault: charging is no longer possible because the battery pack is defective. Never charge a defective battery pack; take it out.
Safety first
Stop and check this first
- Never charge or use a defective battery pack when the charger shows Fault (Red LED: Flashing and Green LED: Flashing): take the battery pack out of the charger immediately and disconnect the charger from the mains supply.
- When shipping or disposing of batteries and cordless tools, always ensure that they are packed individually in plastic bags to prevent short circuits and fires, and never dispose of batteries in household waste.
Safe checks you can perform
- Take the battery pack out of the charger and verify the exact row in section 12
- Check whether there is voltage at the socket outlet and good contact at the charging contacts
- Press the button for the battery charge level indicator (3 LEDs) off the charger
Leave these tasks to a qualified professional
- Do not attempt this professional task: Sending both the charger and the battery pack to the Einhell customer service center
- Do not attempt this professional task: Replacement and separate collection of a defective Power X-Change battery pack
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.
Sending both the charger and the battery pack to the Einhell customer service center
What they doIf the battery pack still fails to charge after checking that there is voltage at the socket outlet and good contact at the charging contacts, send both the charger and the battery pack to the Einhell customer service center.
They must show younormal charging completing with Red LED: Off and Green LED: On (READY TO GO).
In writingthe model/type (GE-CT 18/28 Li), article number (34.112.42), ID number (21024) and service inspection finding.
Replacement and separate collection of a defective Power X-Change battery pack
What they doWhen the row Red LED: Flashing and Green LED: Flashing in section 12 confirms that charging is no longer possible because the battery pack is defective, an Einhell service partner or dealer arranges replacement and proper recycling.
They must show youproper charging and operation with the replacement 18 V Power X-Change series lithium-ion battery.
In writingthe spare part number of the required replacement battery and proof of warranty or disposal registration.
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.
Take the battery pack out of the charger and verify the exact row in section 12
- Who:
- you, without tools, removing the battery pack from the charger right away.
- How:
- follow the action in the row Red LED: Flashing and Green LED: Flashing of section 12 in manual 21024 (take the battery pack out of the charger; never charge a defective battery pack) and distinguish it from other rows of the same table: Red LED: Flashing with Green LED: Off is Adapted charging (gentle charging mode), while Red LED: On with Green LED: On is Temperature fault (keep at room temperature, approx. 20 °C, for one day).
- Result that matters:
- the battery pack safely removed from the charger and the exact charger table row confirmed.
- If Green LED was Off (only Red LED flashing for Adapted charging) or both Red LED and Green LED were On for Temperature fault:
- follow that row in manual 21024.
- If both Red LED is Flashing and Green LED is Flashing (Fault):
- do not attempt to charge the defective battery pack again and proceed to the next check.
- Evidence to keep:
- a short video showing the Red LED and Green LED states before removing the battery pack.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
Check whether there is voltage at the socket outlet and good contact at the charging contacts
- Who:
- you, inspecting the socket outlet and contacts with the battery pack removed.
- How:
- as section 5.6 of manual 21024 instructs, check that your mains voltage is the same as that marked on the rating plate of the battery charger, check whether there is voltage at the socket outlet (when plugged in with no battery pack in the charger, section 12 shows Red LED: Off and Green LED: Flashing, Ready for use), and check whether there is good contact at the charging contacts.
- Result that matters:
- confirming that the empty charger shows Green LED: Flashing in standby and that the charging contacts are clean.
- If the empty charger flashes green and poor contact at the terminals was the issue:
- monitor the charger closely.
- If socket voltage and contact are good yet the battery pack still fails to charge:
- keep the battery pack out of the charger.
- Evidence to keep:
- a photo of the charger rating plate and the charging contacts.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
Press the button for the battery charge level indicator (3 LEDs) off the charger
- Who:
- you, with the battery pack detached from both the charger and the GE-CT 18/28 Li trimmer.
- How:
- following section 5.7 of manual 21024, press the button for the battery charge level indicator (Item A) to read the 3 LEDs (Item B) on the pack: All 3 LEDs are lit shows full charge, 2 or 1 LED(s) are lit shows adequate remaining charge, 1 LED flashes shows empty, and All LEDs blink means battery temperature is too low (keep at room temperature for one day).
- Result that matters:
- checking whether the battery's own 3-LED indicator also reports a low-temperature or exhaustive-discharge state.
- If All LEDs blink from cold storage and clears after keeping the battery at room temperature for one day:
- low temperature was the cause.
- If the charger again shows Red LED:
- Flashing and Green LED: Flashing (or All LEDs blink reoccurs after one day): arrange inspection with Einhell customer service.
- Evidence to keep:
- a photo of the 3-LED battery charge level indicator and the valid bill of purchase.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
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
- Einhell
- Product type
- Cordless garden tools
Known code variants
- Einhell GE-CT 18/28 Li LED rojo y verde parpadean
- Einhell GE-CT 18/28 Li red and green LED flashing
- Fallo El proceso de carga ya no es posible Einhell
- Fault Charging is no longer possible Einhell
- LED rojo Parpadea y LED verde Parpadea Einhell
- Power X-Charger LED rojo parpadea LED verde parpadea
- Power X-Charger Red LED Flashing Green LED Flashing
- Red and green LED flashing
- Red LED Flashing Green LED Flashing Einhell
What it means
Covers the row Red LED: Flashing and Green LED: Flashing in section 12 (Charger indicator) of the Einhell original operating instructions for the GE-CT 18/28 Li and GE-CT 18/28 Li TC 18 V Power X-Change trimmers (Art.-No. 34.112.42, I.-No. 21024). That row states Fault: Charging is no longer possible. The battery pack is defective. Action: Never charge a defective battery pack. Take the battery pack out of the charger. Other models may differ (on the Power-X-Charger 18V 2h in manual 34.111.02 / 11017, Red and green are flashing alternately indicates a temperature fault and Red is flashing indicates a battery pack or charger fault), and this LED state alone never proves which part failed.
Warnings and stop conditions
- Highsource verified
Never charge or use a defective battery pack when the charger shows Fault (Red LED: Flashing and Green LED: Flashing): take the battery pack out of the charger immediately and disconnect the charger from the mains supply.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
- Mediumsource verified
When shipping or disposing of batteries and cordless tools, always ensure that they are packed individually in plastic bags to prevent short circuits and fires, and never dispose of batteries in household waste.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
Symptoms and causes
Probable causes · in order
- Defective Power X-Change battery pack (such as after becoming fully discharged)Common
The row Red LED: Flashing and Green LED: Flashing in section 12 of manual 21024 states that the battery pack is defective, and section 5.6 warns never to allow the battery pack to become fully discharged because this will cause it to develop a defect.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
- Poor contact at the charging contacts or missing voltage at the socket outletPossible
Section 5.6 of manual 21024 instructs you, if the battery pack fails to charge, to check whether there is voltage at the socket outlet and whether there is good contact at the charging contacts.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
- Charger and battery pack fault requiring customer service center inspectionLess common
Section 5.6 of manual 21024 states that if the battery pack still fails to charge after checking the socket outlet voltage and charging contacts, you should send both the charger and the battery pack to the customer service center.
Evidence: Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
Virtual technician
Does Red and green LED flashing 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
Einhell GC-CT 18/24 Li P y Power X-Charger 18V 2h manual de instrucciones original 34.111.02
Einhell Germany AG · 2022 · official_doc
- 2
Einhell GE-CT 18/28 Li Power X-Change Original Operating Instructions 34.112.42
Einhell Germany AG · 2025 · official_doc
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