- Garden
- Cordless garden tools
4 LEDs flash red
STIHL HTA 150.0 4 LEDs flash red on AP/AR battery: fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
On STIHL HTA 150.0 and HTA 160.0 pole pruners using STIHL AP or AR batteries, 4 LEDs flash red (with rapid short beeps on STIHL AR backpack batteries) indicates a malfunction in the battery. Remove and reinsert the battery; if the LEDs keep flashing, do not use, charge or store it.
Safety first
Stop and check this first
- If all 4 LEDs continue to flash red after reinserting the battery, do not attempt to charge, use or store the battery, and never open, crush, heat or short-circuit a STIHL AP or AR battery: doing so creates a risk of fire or explosion.
- Never charge or use the battery at ambient temperatures below -4 °F (-20 °C) or above 122 °F (50 °C); if fluid leaks from the battery, avoid contact with skin and eyes, wash exposed skin with soap and water, and seek medical attention if fluid enters the eyes.
Safe checks you can perform
- Press the push button on the removed AP or AR battery and check the 4 red LEDs
- Check the electrical contacts for corrosion and clean the housing and guides dry
- Reinsert the battery until it clicks and switch on the pole pruner
Leave these tasks to a qualified professional
- Do not attempt this professional task: Replacement and safe disposal of the malfunctioning STIHL AP or AR battery
- Do not attempt this professional task: Inspection of the pole pruner battery compartment contacts at a STIHL dealer
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 safe disposal of the malfunctioning STIHL AP or AR battery
What they doWhen the 4 LEDs continue to flash red after you remove the battery, reinsert it and switch on the pole pruner, an authorized STIHL servicing dealer inspects the AP or AR battery and arranges replacement.
They must show youthe battery evaluation result and normal HTA 150.0 or 160.0 operation with a verified replacement battery.
In writingthe serial number of the replaced STIHL AP or AR battery and warranty or recycling details.
Inspection of the pole pruner battery compartment contacts at a STIHL dealer
What they doIf corrosion or wear on the electrical contacts inside the HTA 150.0 or HTA 160.0 battery compartment prevents reliable contact with the battery, the authorized STIHL servicing dealer repairs the compartment assembly.
They must show youclean, secure electrical contacts in the pole pruner battery compartment.
In writingthe electrical inspection report for the HTA 150.0 or HTA 160.0 and any genuine STIHL parts fitted.
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.
Press the push button on the removed AP or AR battery and check the 4 red LEDs
- Who:
- you, after releasing the trigger switch and compressing the locking levers to eject the battery.
- How:
- follow Sections 12.1.1, 12.2.1 and 15.2 of the manual: release the trigger switch, compress locking levers (1) to eject battery (2), and press the push button on the battery to see whether all 4 LEDs flash red (or the four right-side LEDs flash red with a rapid succession of short beeps on a STIHL AR battery).
- Result that matters:
- confirming the 4 flashing red LEDs and checking the battery casing off the tool.
- If the battery is cracked, deformed, leaking or abnormally hot:
- do not reinsert it and contact your authorized STIHL servicing dealer.
- If the battery housing is intact:
- proceed to inspect the electrical contacts and clean the guides dry.
- Evidence to keep:
- a short video clip of the 4 red LEDs flashing (and the rapid short beeps if using a STIHL AR pack).
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
Check the electrical contacts for corrosion and clean the housing and guides dry
- Who:
- you, using a soft brush or soft, dry cloth away from metal objects.
- How:
- following Sections 6.5.1 and 22.1 of manual 0458-038-8601-A, visually inspect the contacts in the battery compartment and on the battery for corrosion or other foreign matter, and clean the battery housing and guides with a soft brush or a soft, dry cloth.
- Result that matters:
- clean, dry battery guides and contacts free of foreign matter.
- If corrosion or contact damage is visible:
- do not use the unit and have it checked by an authorized STIHL servicing dealer.
- If the contacts and guides are clean and undamaged:
- perform the reinsertion and switch-on test from Section 24.1.
- Evidence to keep:
- a clear photo of the battery terminals and the pole pruner battery compartment contacts.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
Reinsert the battery until it clicks and switch on the pole pruner
- Who:
- you, holding the HTA 150.0 or 160.0 with both hands between 14 °F and 104 °F (-10 °C to 40 °C).
- How:
- following Sections 15.1 and 16.1, insert battery (1) into compartment (2) until it stops with an audible click and the locking levers sit flush; depress and hold trigger switch lockout (1), push retaining latch (2) forward with your thumb and release it so the LED glows, then squeeze trigger switch (3).
- Result that matters:
- checking whether the battery LEDs glow green for about 5 seconds and the pole pruner starts.
- If the LEDs glow green and the pole pruner runs:
- an incomplete seating contact triggered the flash.
- If the 4 LEDs continue to flash red:
- remove the battery, do not attempt to charge, use or store it, and contact an authorized STIHL servicing dealer.
- Evidence to keep:
- a note of the pole pruner model (HTA 150.0 or 160.0) and the AP or AR battery serial number.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
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
- STIHL
- Product type
- Cordless garden tools
Known code variants
- 4 LEDs destellan en rojo
- 4 LEDs flash red
- Four right side LEDs flash red STIHL AR
- If all 4 LEDs flash red
- La batería no funciona correctamente STIHL AP AR
- Malfunction in battery STIHL AP AR
- Si los cuatro LED destellan en rojo STIHL
- STIHL HTA 150.0 4 LEDs destellan en rojo
- STIHL HTA 150.0 4 LEDs flash red
- STIHL HTA 160.0 4 LEDs destellan en rojo
- STIHL HTA 160.0 4 LEDs flash red
What it means
STIHL manual 0458-038-8601-A for the STIHL HTA 150.0 and HTA 160.0 pole pruners (using STIHL AP series or STIHL AR backpack batteries) documents in Section 24.1 the row where the pole pruner does not start when switched on and 4 LEDs flash red (on STIHL AR only, a rapid succession of short beeps sounds while the four right-side LEDs flash red): the possible cause is a malfunction in the battery. The remedy is to remove the battery, reinsert it and switch on the pole pruner; if the LEDs continue to flash, do not attempt to use, charge or store the battery and contact an authorized STIHL dealer. Other models may differ, and a single flash never proves a fault before reinserting the pack.
Warnings and stop conditions
- Highsource verified
If all 4 LEDs continue to flash red after reinserting the battery, do not attempt to charge, use or store the battery, and never open, crush, heat or short-circuit a STIHL AP or AR battery: doing so creates a risk of fire or explosion.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
- Highsource verified
Never charge or use the battery at ambient temperatures below -4 °F (-20 °C) or above 122 °F (50 °C); if fluid leaks from the battery, avoid contact with skin and eyes, wash exposed skin with soap and water, and seek medical attention if fluid enters the eyes.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
Symptoms and causes
Probable causes · in order
- Temporary seating interruption when inserting the STIHL AP or AR batteryCommon
The troubleshooting table in Section 24.1 of manual 0458-038-8601-A instructs you to remove the battery and reinsert it (Section 15) before concluding that the battery must be replaced.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
- Corrosion or foreign matter on the battery compartment contacts or guidesPossible
Sections 6.5.1, 22.1 and 24.1 of the HTA 150.0 and HTA 160.0 manual direct you to visually check the electrical contacts in the battery compartment and on the battery for corrosion or foreign matter and keep the housing and guides clean.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
- Internal malfunction in the STIHL AP or STIHL AR battery packPossible
According to Sections 12.1.1, 12.2.1 and 24.1 of manual 0458-038-8601-A, if the 4 LEDs continue to flash red after you remove and reinsert the battery and switch on the pole pruner, the battery has a malfunction and must be replaced.
Evidence: STIHL HTA 150.0, 160.0 Pole Pruner Instruction Manual / Manual de instrucciones (0458-038-8601-A, English & Español, AP/AR Battery LEDs & Troubleshooting)
Virtual technician
Does 4 LEDs flash red 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
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