Sump Pump Not Working? When to Call a Plumber for Repair

A sump pump that isn’t working during a heavy rainstorm is a homeowner’s race against time. I’ve seen firsthand the damage a flooded basement can cause. Before you panic, let’s quickly walk through some common issues. This guide will help you determine if it’s a simple fix or if you need to call a plumber for sump pump repair, fast.

Key Takeaways

Power is the #1 Culprit: The most common reason a sump pump fails is a lack of power. Always check the plug, GFCI outlet, and circuit breaker first.
Test the Float Switch: This switch tells the pump when to turn on. It can easily get stuck or tangled.
Clear Debris: Blockages in the pump’s intake or the discharge pipe can prevent it from working.
Know When to Stop: If the motor hums but doesn’t pump, or if you smell something burning, the problem is beyond a simple DIY fix. Call a pro immediately.

Quick Troubleshooting Under Pressure

Work through this list in order. Time is of the essence.

Safety First: Unplug Before Cleaning

Before you attempt to clear any debris from the pump or pit (Step 3), you must unplug the sump pump from the wall outlet to eliminate the risk of electric shock.

Step 1: Check the Power - The #1 Culprit

I know it sounds too simple, but you’d be surprised how often the issue is just power.

Power Supply Checklist

**Is it plugged in?** Check that the cord is firmly plugged into the wall outlet. **Check the GFCI Outlet:** If it's a GFCI outlet (with 'Test' and 'Reset' buttons), press the 'Reset' button firmly. **Check the Circuit Breaker:** Go to your home's main electrical panel and check if the breaker for the sump pump has tripped. If it has, flip it back to the 'ON' position.

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Step 2: Inspect the Float Switch

The float switch is like the float in your toilet tank; it rises with the water level and tells the pump to turn on. Sometimes, it just gets stuck.

How to Check: Look into the sump pit. The float switch should be able to move freely. If it’s tangled in the power cord or jammed against the side of the pit, untangle it. You can also gently lift the float switch with your hand or a long stick to see if the pump kicks on.

Step 3: Clear the Discharge Pipe & Impeller

If the water can’t get out, the pump can’t do its job.

Check the Outdoor Pipe: Go outside and ensure the discharge pipe opening isn’t blocked by mulch, rocks, or other debris.
Check the Pump Intake: With the pump unplugged, check the screen at the bottom. It can get clogged with mud, silt, or small pebbles, preventing water from entering.

The Red Line: When to Call a Plumber IMMEDIATELY

If you’ve run through the quick checks above and your sump pump is still not working, you have reached the limit of safe DIY troubleshooting. It’s time to call a licensed plumber. Call immediately if you notice:

The Motor Hums but Doesn’t Pump: This is a classic sign that the motor has seized or the capacitor has failed. The pump needs to be professionally serviced or replaced.
The Pump Runs Constantly (Won’t Shut Off): This could be a faulty float switch or a failed check valve that’s allowing water to flow back into the pit. This situation can quickly burn out the pump’s motor.
Obvious Electrical Issues or a Burning Smell: This is an extreme fire hazard. Do not touch the pump. Go directly to your breaker box, shut off the power to the pump, and call a professional.
The Pump is 7-10+ Years Old: Sump pumps are not lifetime devices. If your pump is old, investing in a repair might not be cost-effective compared to replacing it with a new, more reliable unit.

From an electrician’s standpoint, a sump pump motor that runs continuously is a significant fire hazard. It’s not designed for non-stop operation and can easily overheat, tripping breakers or, in worst-case scenarios, leading to an electrical fire in your basement. If your pump won’t shut off, cut the power at the breaker and call a professional.

Brian Mitchell • Licensed Electrician

Sump Pump Repair vs. Replacement Costs

When you call a professional, the big question is often whether to repair or replace your unit. For pumps over 7 years old, investing in a significant repair is often not a wise long-term investment. Replacing it with a new, reliable unit provides peace of mind and is usually more cost-effective.

Typical Sump Pump Service & Replacement Costs

Professional Service	Typical Cost Range	Our Recommendation
Emergency Service Call & Diagnosis	$150 - $300	The initial cost to identify the problem.
Float Switch Replacement	$150 - $250	A common and worthwhile repair.
Check Valve Replacement	$150 - $300	An effective fix for a constantly running pump.
New Sump Pump Installation (Replacement)	$450 - $1,200	The best option for a pump that is over 7 years old.
Battery Backup System Installation	$600 - $2,000+	A critical upgrade for homes in high-risk flood zones.

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Multiple water management issues? When your sump pump fails, it’s time to assess your entire water system. Check our water heater calculator to budget for upgrades while addressing water concerns.

Who to Call? Plumber vs. Handyman

When your basement is on the line, who do you call? For a critical piece of equipment like a sump pump, which protects one of your largest assets, I always recommend calling a licensed plumber. A plumber won’t just fix the immediate issue; they can diagnose problems with the entire drainage system, including the check valve and discharge lines, and ensure any new installation is fully compliant with local plumbing codes. This is a level of expertise you won’t get from a general handyman.