Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine LOW FLOW Error Fix: Low Water Flow Output

Pump delivers less water flow than expected — check the inlet strainer for debris clogs, inspect the impeller for wear or damage, look for air leaks in the suction plumbing, and verify the total suction lift is within specifications

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error LOW FLOW on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Low Water Flow Output. The top-ranked community fix is “Inspect and Replace Impeller, Check for Air Leaks in Suction Line” (hard difficulty, ~60 min, DIY cost: $20-$40). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water pump

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 water pump 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-$250.

Other Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error Codes

Carburetor Clogged

Pump Cavitation

Engine Will Not Start

Pump Leaking Water

Pump Ran Without Water

2 fixes

SURGING

Engine Surges or Hunts

2 fixes

WONT PRIME

Pump Will Not Prime

2 fixes

People Also Ask About Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine Error LOW FLOW

What does error code LOW FLOW mean on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

Error code LOW FLOW on the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine means: Low Water Flow Output. Pump delivers less water flow than expected — check the inlet strainer for debris clogs, inspect the impeller for wear or damage, look for air leaks in the suction plumbing, and verify the total suction lift is within specifications

How do I fix error code LOW FLOW on my Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine?

The most successful fix is "Inspect and Replace Impeller, Check for Air Leaks in Suction Line" (hard difficulty, ~60 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

Is error code LOW FLOW on a Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine 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 Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error LOW FLOW myself?

Yes — the top-ranked community fix ("Inspect and Replace Impeller, Check for Air Leaks in Suction Line") is rated hard difficulty and takes about 60 minutes. Tools needed: 10mm socket wrench, Impeller puller, Flathead screwdriver, Soapy water spray bottle.

How much does it cost to repair Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine error LOW FLOW?

DIY cost: $20-$40. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes, including: CARBURETOR CLOGGED (Carburetor Clogged), CAVITATION (Pump Cavitation), ENGINE WONT START (Engine Will Not Start), LEAKING (Pump Leaking Water), RUN DRY DAMAGE (Pump Ran Without Water), and 2 more.

What other error codes does the Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine have?

The Honda WB20 2-Inch General Purpose Water Pump with Honda GX120 118cc Engine has 7 other known error codes:

CARBURETOR CLOGGED — Carburetor Clogged (2 fixes)
CAVITATION — Pump Cavitation (2 fixes)
ENGINE WONT START — Engine Will Not Start (2 fixes)
LEAKING — Pump Leaking Water (2 fixes)
RUN DRY DAMAGE — Pump Ran Without Water (2 fixes)
SURGING — Engine Surges or Hunts (2 fixes)
WONT PRIME — Pump Will Not Prime (2 fixes)

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