🌿String Trimmer

RUNS ROUGH

Husqvarna · 525LST 25.4 cc 17 in Gas String Trimmer

Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer RUNS ROUGH Error Fix: Engine Runs Rough or Surges

The engine surges, bogs, or runs unevenly — clean or rebuild the carburetor; replace the fuel filter; check for crankcase air leaks at the crankcase seals or cylinder base gasket; a lean air leak causes the engine to surge and run hot; on 2-stroke engines, crankcase integrity is critical for proper fuel delivery

Medium severity2 fixes available

Quick Answer

Error RUNS ROUGH on the Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer means: Engine Runs Rough or Surges. The top-ranked community fix is “Rebuild Carburetor and Inspect Crankcase Seals” (hard difficulty, ~90 min, DIY cost: $25-$40). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · string trimmer

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many string trimmer repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$220.

Other Husqvarna Models with Error RUNS ROUGH

350BT 50.2 cc Gas Backpack Leaf Blower

leaf_blower · 2 fixes

455 Rancher 55.5 cc 3.5 HP Gas Chainsaw with X-Torq Engine and Air Injection

chainsaw · 2 fixes

460 Rancher 24 in 60cc Gas Chainsaw

chainsaw · 2 fixes

Other Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer Error Codes

AIR FILTER

Air Filter Clogged

2 fixes

CLUTCH SLIP

Clutch Slipping Under Load

2 fixes

CORD WON'T RETRACT

Pull Cord Will Not Retract

Engine Dies at Idle

Exhaust Port or Muffler Blocked

Fuel System Leak

Trimmer Head Spins at Idle

2 fixes

HIGH VIBRATION

Excessive Vibration

2 fixes

People Also Ask About Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer Error RUNS ROUGH

What does error code RUNS ROUGH mean on a Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer?

Error code RUNS ROUGH on the Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer means: Engine Runs Rough or Surges. The engine surges, bogs, or runs unevenly — clean or rebuild the carburetor; replace the fuel filter; check for crankcase air leaks at the crankcase seals or cylinder base gasket; a lean air leak causes the engine to surge and run hot; on 2-stroke engines, crankcase integrity is critical for proper fuel delivery

How do I fix error code RUNS ROUGH on my Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer?

The most successful fix is "Rebuild Carburetor and Inspect Crankcase Seals" (hard difficulty, ~90 minutes). Estimated DIY cost: $25-$40. HomeMD has 2 community-ranked fixes for this error.

Is error code RUNS ROUGH on a Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer error RUNS ROUGH myself?

Yes — the top-ranked community fix ("Rebuild Carburetor and Inspect Crankcase Seals") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Needle-nose pliers, Carburetor cleaner spray, Compressed air, Multimeter.

How much does it cost to repair Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer error RUNS ROUGH?

DIY cost: $25-$40. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer have?

The Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer has 8 other known error codes, including: AIR FILTER (Air Filter Clogged), CLUTCH SLIP (Clutch Slipping Under Load), CORD WON'T RETRACT (Pull Cord Will Not Retract), DIES AT IDLE (Engine Dies at Idle), EXHAUST CLOGGED (Exhaust Port or Muffler Blocked), and 3 more.

Which other Husqvarna models have the RUNS ROUGH error?

Error code RUNS ROUGH also appears on 3 other Husqvarna models: 350BT 50.2 cc Gas Backpack Leaf Blower, 455 Rancher 55.5 cc 3.5 HP Gas Chainsaw with X-Torq Engine and Air Injection, 460 Rancher 24 in 60cc Gas Chainsaw. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer have?

The Husqvarna 525LST 25.4 cc 17 in Gas String Trimmer has 8 other known error codes:

AIR FILTER — Air Filter Clogged (2 fixes)
CLUTCH SLIP — Clutch Slipping Under Load (2 fixes)
CORD WON'T RETRACT — Pull Cord Will Not Retract (2 fixes)
DIES AT IDLE — Engine Dies at Idle (2 fixes)
EXHAUST CLOGGED — Exhaust Port or Muffler Blocked (2 fixes)
FUEL LEAK — Fuel System Leak (2 fixes)
HEAD SPINS AT IDLE — Trimmer Head Spins at Idle (2 fixes)
HIGH VIBRATION — Excessive Vibration (2 fixes)

Which other Husqvarna models have the RUNS ROUGH error?

Error code RUNS ROUGH also appears on 3 other Husqvarna models:

350BT 50.2 cc Gas Backpack Leaf Blower (leaf blower) · 2 fixes
455 Rancher 55.5 cc 3.5 HP Gas Chainsaw with X-Torq Engine and Air Injection (chainsaw) · 2 fixes
460 Rancher 24 in 60cc Gas Chainsaw (chainsaw) · 2 fixes

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