Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw CHAIN LOOSE Error Fix: Chain Comes Off the Guide Bar

The cutting chain repeatedly derails (comes off) the guide bar during operation. A chain that comes off the bar is a serious safety hazard. Stop immediately if the chain derails. Common causes: The chain tension is too loose — the chain should hang snugly against the underside of the bar with no visible sag, but should still be pullable by hand. Tighten using the chain tensioning mechanism (usually a knob or screw on the side panel). The guide bar groove may be worn or spread — check the bar rails for wear by sliding a coin into the groove; if the coin fits loosely, the bar is worn and should be replaced. The drive links on the chain may be worn — hold the chain and check that the drive links fit snugly in the bar groove. The bar may not be properly secured — check that the bar mounting nuts/knobs are tight. Always check chain tension before each use, as the chain stretches during use and needs periodic retensioning during a cutting session.

warning2 fixes available✨ Free fix available

Quick Answer

Error CHAIN LOOSE on the Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw means: Chain Comes Off the Guide Bar. The top-ranked community fix is “Replace Worn Guide Bar or Chain Drive Links” (medium difficulty, ~40 min, DIY cost: $40-$80). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · chainsaw

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 chainsaw 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 Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw Error Codes

BATT ALL BLINK

Battery Fault — All 4 LEDs Blinking

2 fixes

BATT COLD

Battery Too Cold to Operate or Charge

2 fixes

BATT DEPLETED

Battery Fully Depleted — No LEDs Lit

2 fixes

BATT OVERHEAT

Battery Over-Temperature — Tool Shuts Down

2 fixes

CHAIN BRAKE STUCK

Chain Brake Won't Release

2 fixes

CHAIN STRETCH

Chain Has Stretched Beyond Adjustment Range

2 fixes

CHAIN WON'T MOVE

Chain Not Moving When Trigger Is Pulled

2 fixes

CHARGER RED-GREEN

Charger Alternating Red/Green — Defective Battery

2 fixes

People Also Ask About Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw Error CHAIN LOOSE

What does error code CHAIN LOOSE mean on a Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw?

Error code CHAIN LOOSE on the Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw means: Chain Comes Off the Guide Bar. The cutting chain repeatedly derails (comes off) the guide bar during operation. A chain that comes off the bar is a serious safety hazard. Stop immediately if the chain derails. Common causes: The chain tension is too loose — the chain should hang snugly against the underside of the bar with no visible sag, but should still be pullable by hand. Tighten using the chain tensioning mechanism (usually a knob or screw on the side panel). The guide bar groove may be worn or spread — check the bar rails for wear by sliding a coin into the groove; if the coin fits loosely, the bar is worn and should be replaced. The drive links on the chain may be worn — hold the chain and check that the drive links fit snugly in the bar groove. The bar may not be properly secured — check that the bar mounting nuts/knobs are tight. Always check chain tension before each use, as the chain stretches during use and needs periodic retensioning during a cutting session.

How do I fix error code CHAIN LOOSE on my Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw?

The most successful fix is "Replace Worn Guide Bar or Chain Drive Links" (medium difficulty, ~40 minutes). Estimated DIY cost: $40-$80. HomeMD has 2 community-ranked fixes for this error.

Is error code CHAIN LOOSE on a Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw serious?

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw error CHAIN LOOSE myself?

Yes — the top-ranked community fix ("Replace Worn Guide Bar or Chain Drive Links") is rated medium difficulty and takes about 40 minutes. Tools needed: 13mm wrench or socket, Flathead screwdriver, Gloves.

How much does it cost to repair Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw error CHAIN LOOSE?

DIY cost: $40-$80. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw have?

The Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw has 8 other known error codes, including: BATT ALL BLINK (Battery Fault — All 4 LEDs Blinking), BATT COLD (Battery Too Cold to Operate or Charge), BATT DEPLETED (Battery Fully Depleted — No LEDs Lit), BATT OVERHEAT (Battery Over-Temperature — Tool Shuts Down), CHAIN BRAKE STUCK (Chain Brake Won't Release), and 3 more.

What other error codes does the Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw have?

The Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw has 8 other known error codes:

BATT ALL BLINK — Battery Fault — All 4 LEDs Blinking (2 fixes)
BATT COLD — Battery Too Cold to Operate or Charge (2 fixes)
BATT DEPLETED — Battery Fully Depleted — No LEDs Lit (2 fixes)
BATT OVERHEAT — Battery Over-Temperature — Tool Shuts Down (2 fixes)
CHAIN BRAKE STUCK — Chain Brake Won't Release (2 fixes)
CHAIN STRETCH — Chain Has Stretched Beyond Adjustment Range (2 fixes)
CHAIN WON'T MOVE — Chain Not Moving When Trigger Is Pulled (2 fixes)
CHARGER RED-GREEN — Charger Alternating Red/Green — Defective Battery (2 fixes)

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