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Green LED on and red LED flashes
Husqvarna P4A 18-C70 Green LED on and red LED flashes: fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Husqvarna P4A 18-C70 and P4A 18-C100 battery chargers (Aspire T28-P4A manual), Green LED on and red LED flashes indicates that the battery is not correctly installed, the battery and charger connectors are dirty, the battery is damaged, or the charger identified an internal error.
Safety first
Stop and check this first
- Never open the battery or charger, never service damaged battery packs yourself, and use the P4A 18-C70 or P4A 18-C100 battery charger indoors only in dry conditions with 18 V POWER FOR ALL system batteries of 1.5 Ah and above.
- Only charge the battery when the ambient temperature is between 0 °C (32 °F) and 35 °C (95 °F), never clean the battery or charger with water, and never pull the power cord to disconnect the charger from the socket outlet.
Safe checks you can perform
- Remove the battery and insert and remove it from the charger several times
- Clean the battery terminals, guide tracks and charger surfaces dry without water
- Make sure the battery is fully inserted, then remove and reinsert the mains plug
Leave these tasks to a qualified professional
- Do not attempt this professional task: Replacement and recycling of a damaged P4A battery by an authorized service provider
- Do not attempt this professional task: Check of the P4A 18-C70 or P4A 18-C100 charger at an authorized Husqvarna service center
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.
Replacement and recycling of a damaged P4A battery by an authorized service provider
What they doWhen the authorized service center confirms that the charger is working properly and that a damaged P4A 18-B45 or P4A 18-B72 battery is causing the flashing red LED, they replace the battery and collect the defective unit for recycling.
They must show younormal charging of the replacement 18 V POWER FOR ALL battery on your charger.
In writingthe replacement P4A 18-B45 or P4A 18-B72 battery reference and confirmation of environmentally friendly disposal.
Check of the P4A 18-C70 or P4A 18-C100 charger at an authorized Husqvarna service center
What they doIf the green LED stays on and the red LED continues to flash after you clean the connectors, make sure the battery is fully inserted, and remove and reinsert the mains plug, an authorized after-sales service center for Husqvarna products checks the battery charger.
They must show youthe P4A 18-C70 or P4A 18-C100 charger flashing green while charging and turning steadily green when full.
In writingthe inspection result for the P4A 18-C70 or P4A 18-C100 battery charger and warranty coverage.
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 the battery and insert and remove it from the charger several times
- Who:
- you, working indoors in a dry area between 0 °C (32 °F) and 35 °C (95 °F).
- How:
- follow the first two solutions in the Battery charger troubleshooting table of manual 1885-007: remove the battery (P4A 18-B45 or P4A 18-B72) from the P4A 18-C70 or P4A 18-C100 charger, insert and remove it several times to wipe the connectors, and seat it firmly.
- Result that matters:
- clean contact surfaces and a fully seated battery in the charger slot.
- If the charging LED flashes green normally:
- incomplete seating or light surface dirt caused the alert.
- If the green LED stays on and the red LED still flashes:
- unplug the charger and clean the terminals dry.
- Evidence to keep:
- a short video clip showing the green and red LEDs on the P4A 18-C70 or P4A 18-C100 charger.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
Clean the battery terminals, guide tracks and charger surfaces dry without water
- Who:
- you, using compressed air or a soft and dry cloth with the charger unplugged.
- How:
- following the section To clean the battery and the battery charger in manual 1885-007, make sure both units are clean and dry, clean the battery terminals with compressed air or a soft and dry cloth, wipe the surfaces and battery guide tracks with a soft and dry cloth, and never use water.
- Result that matters:
- clean, dry battery terminals, guide tracks and charger connectors.
- If the battery casing is cracked or the charger cord is damaged:
- stop using the equipment and contact an authorized service agent.
- If the terminals and cord are clean and undamaged:
- proceed to the mains plug reset.
- Evidence to keep:
- a clear photo of the cleaned battery terminals and P4A charger connector slot.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
Make sure the battery is fully inserted, then remove and reinsert the mains plug
- Who:
- you, using a grounded indoor socket matching the charger rating plate.
- How:
- follow the fourth solution in the Battery charger table of manual 1885-007: make sure the battery is fully inserted, remove the mains plug from the socket outlet without pulling the power cord, and reinsert it into a grounded outlet matching the rating plate voltage and frequency (50-60 Hz).
- Result that matters:
- the charger LED flashing green once on connection and then flashing green to charge.
- If the charger flashes green and charges the battery:
- the internal charger error reset succeeded.
- If the error occurs again with the green LED on and red LED flashing:
- ask an authorized after-sales service center for Husqvarna products to check the battery charger and battery.
- Evidence to keep:
- a photo of the rating plate on the P4A 18-C70 (70 W) or P4A 18-C100 (105 W) charger.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
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
- Husqvarna
- Product type
- Cordless garden tools
Known code variants
- Cargador Husqvarna P4A 18-C100 LED rojo parpadea
- Cargador Husqvarna P4A 18-C70 LED rojo parpadea
- El cargador ha identificado un error interno Husqvarna
- El LED verde está encendido fijo y el LED rojo parpadea
- Green LED on and red LED flashes
- Husqvarna P4A 18-C100 red LED flashes
- Husqvarna P4A 18-C70 red LED flashes
- The charger identifies an internal error Husqvarna
- The green LED is on and the red LED flashes
- The green LED is on and the red LED flashes (For P4A 18-C70 and P4A 18-C100)
What it means
Husqvarna manual 1885-007 (09.06.2025, Aspire T28-P4A grass trimmer with 18 V P4A 18-B45 and P4A 18-B72 batteries) documents in the Battery charger troubleshooting table the row The green LED is on and the red LED flashes (For P4A 18-C70 and P4A 18-C100) with four causes: the battery is not correctly installed in the charger, the battery and charger connectors are dirty, the battery is damaged, or the charger identifies an internal error. If the error recurs after reseating, cleaning connectors, and removing and reinserting the mains plug, have an authorized Husqvarna service center check the charger. Other models may differ, and this LED pattern alone never proves a charger fault.
Warnings and stop conditions
- Highsource verified
Never open the battery or charger, never service damaged battery packs yourself, and use the P4A 18-C70 or P4A 18-C100 battery charger indoors only in dry conditions with 18 V POWER FOR ALL system batteries of 1.5 Ah and above.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
- Mediumsource verified
Only charge the battery when the ambient temperature is between 0 °C (32 °F) and 35 °C (95 °F), never clean the battery or charger with water, and never pull the power cord to disconnect the charger from the socket outlet.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
Symptoms and causes
Probable causes · in order
- The battery is not correctly installed in the P4A 18-C70 or C100 chargerCommon
The first cause listed in this troubleshooting row of manual 1885-007 is that the battery is not properly seated in the battery charger, requiring you to remove the battery and install it in the charger again.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
- The battery connectors and the battery charger connectors are dirtyCommon
The second cause in manual 1885-007 states that dirty connectors on the battery and on the P4A 18-C70 or P4A 18-C100 charger trigger the alert, and suggests inserting and removing the battery several times to clean them.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
- The P4A 18-C70 or P4A 18-C100 charger identifies an internal errorPossible
The fourth cause in the Battery charger table notes that the charger may identify an internal error, requiring you to make sure all batteries are fully inserted and to remove and reinsert the mains plug.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
- The 18 V POWER FOR ALL battery pack is damagedLess common
The third cause documented in manual 1885-007 for the green LED on and red LED flashing state is that the battery is damaged and must be replaced.
Evidence: Husqvarna Aspire T28-P4A Operator's Manual / Manual de usuario (1885-007, Troubleshooting User Interface & P4A Battery Charger)
Virtual technician
Does Green LED on and red LED flashes 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
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