Water Pump Not Working? Complete Troubleshooting Guide for Home Pumps

When your water pump fails, it can feel urgent — no water pressure, a flooded basement, or a pool that won't circulate. The good news: most pump problems have straightforward causes and fixes.

This guide covers the most common issues for sump pumps, shallow well jet pumps, pool pumps, and pressure washers — and how to solve them.

Quick Diagnosis: What's Your Pump Doing?

Sump Pump Troubleshooting

Problem 1: Sump Pump Won't Turn On

Check these first:

• Is it plugged in? Check the outlet with another device.
• Test the float switch — lift it manually. If the pump runs, the float is stuck.
• Check the circuit breaker and reset if tripped.
• If none of these work, the motor may have burned out.

Problem 2: Sump Pump Runs Constantly

• The float switch is stuck in the "on" position — clean or replace it.
• Your pit may be too small or the water table is unusually high.
• Check if the discharge line is clogged, causing water to recirculate back into the pit.

Problem 3: Sump Pump Has No Power

• Unplug and plug back in — reset the GFCI outlet if it has one.
• Check if the thermal overload protector tripped (common after extended runs). Let the pump cool for 30 minutes.

Problem 4: Sump Pump is Making Strange Noises

• Rattling: Debris in the impeller — disconnect power and remove any blockage.
• Grinding: Worn or damaged impeller — may need replacement.
• Gurgling: Normal discharge noise, but check the discharge line for partial clogs.

Shallow Well Jet Pump Troubleshooting

Problem 1: Jet Pump Won't Prime / No Water Flow

This is the most common jet pump issue.

• Check that all valves are fully open.
• Ensure the foot valve (at the bottom of the suction pipe) is not stuck or damaged.
• Fill the pump housing with water and try to prime manually.
• If it still won't prime, the suction line may have an air leak — inspect all joints and connections.

Problem 2: Jet Pump Has Low Pressure

• Check and clean the in-line filter or strainer.
• Inspect the pressure switch setting — it may be set too low.
• The impeller may be worn — this often requires professional service or replacement.
• Air leak in the suction line will also reduce pressure significantly.

Problem 3: Jet Pump Runs but Pressure Drops Quickly

• Your pressure tank may have lost its air charge. Check the tank's air pressure with a tire gauge (should be 2 PSI below the pump's cut-in pressure).
• If the tank feels full of water when tapped (no hollow sound), the bladder is likely failed — replace the tank.

Problem 4: Pump Cycles On and Off Rapidly (Short Cycling)

• Failed pressure tank bladder is the #1 cause.
• Check and recharge tank air pressure, or replace the tank.

Pool Pump Troubleshooting

Problem 1: Pool Pump Won't Start

• Check the circuit breaker and timer settings.
• Inspect the capacitor (a common failure point) — a failed capacitor often causes a humming sound with no motor spin.
• Verify the pump lid is fully seated and sealed.

Problem 2: Pool Pump Has No Suction / Poor Flow

• The strainer basket is clogged — clean it.
• Air is entering the system — check the pump lid O-ring and all fittings for leaks.
• The impeller may be clogged with debris — shut off power and clear it.

Problem 3: Pool Pump is Leaking

• Leaking from the front seal: the shaft seal is worn — replace it.
• Leaking from the lid: the O-ring is damaged or dry — lubricate or replace.

Problem 4: Pool Pump is Noisy

• Cavitation (starved for water): check for blockages in the skimmer or suction lines.
• Worn bearings: loud screeching or grinding — bearings need replacement.

Pressure Washer Troubleshooting

Problem 1: Pressure Washer Has No Pressure

• Check the water supply — make sure the hose is fully open and kink-free.
• Clean or replace the inlet filter screen.
• Inspect the nozzle for clogs — use a nozzle cleaning tool or a thin wire.
• Air trapped in the pump — run the machine without the spray gun briefly to bleed air.

Problem 2: Pressure Washer Pulsates / Surges

• Partially clogged nozzle — clean or replace.
• Insufficient water supply — use a larger diameter hose or increase supply pressure.
• Air in the pump — bleed as above.

Problem 3: Pressure Washer Leaks from the Gun or Hose

• Inspect all O-rings and connections — tighten or replace as needed.
• Replace any cracked hoses or damaged fittings.

When to Call a Professional

Consider professional repair or replacement if:

• The motor is burned out (smell of burning, no response to any fix)
• The pump is more than 7–10 years old and having repeated issues
• You have electrical concerns — always prioritize safety
• The repair cost exceeds 50% of a new pump's price

Prevention Tips: Keep Your Pump Running Longer

• Test your sump pump every 6 months by pouring water into the pit.
• Clean pump filters and strainers at the start of each season.
• Check pressure tank air charge annually.
• Inspect discharge lines for blockages before rainy season.
• Winterize outdoor pumps before freezing temperatures arrive.

Shop Replacement Pumps

If your pump is beyond repair, JUNHE PUMPS carries reliable FOTING sump pumps, shallow well jet pumps, and pool pumps built for long-term home use.

Have a specific pump problem not covered here? Leave a comment or contact our support team — we'll help you diagnose it.