Plug in outlet tester
Use it for: Shows quickly whether a standard outlet has power and can also flag common wiring problems.
Find a plug-in outlet testerPower check
How to Test an Outlet for Power
To test an outlet for power, first confirm the appliance itself works in another outlet, then use a plug-in outlet tester or a multimeter to see whether the outlet is live and wired correctly.
This is a good first check when an electric heater will not run. The goal is to separate a dead outlet, a tripped reset device, or a breaker issue from a heater problem.
Before you start: Match the outlet style, amperage, voltage, and wiring setup before buying any replacement part or tester. Stop if the repair becomes unsafe or unclear.
Safety first
- Treat the outlet as live until your tester proves otherwise.
- Keep fingers off probe tips and plug blades while testing.
- Do not use a damaged outlet, damaged cord, or loose plug connection.
- Stand on a dry surface and do not test around water or damp flooring.
- If you are not comfortable testing live voltage with a multimeter, use a plug-in tester or call a pro.
Tools you may need
Digital multimeter
Use it for: Lets you confirm voltage when you need a more exact reading or the plug-in tester result is unclear.
Find a digital multimeter
Flashlight
Use it for: Helps you inspect the outlet face, nearby reset buttons, and the breaker panel safely.
Find a flashlight
Non contact voltage tester
Use it for: Adds a quick extra safety check before touching a loose or damaged outlet.
Find a non-contact voltage testerAs an Amazon Associate I earn from qualifying purchases. Repair Riot may earn a commission at no extra cost to you.
Step-by-step fix
Step 1: Make sure this is the right thing to test
- Unplug the heater or other device from the outlet you suspect.
- Plug that same device into another outlet you know is working.
- If the device runs normally there, come back to the original outlet and test that outlet for power.
- If the device does not run anywhere, the problem is likely the device, not the outlet.
If it works: You have good reason to suspect the original outlet is the problem.
If it doesn’t: Try a different appliance you know works, like a lamp or phone charger, to confirm whether the original outlet is actually the issue.
Stop if:
- The outlet face is cracked, scorched, loose in the wall, buzzing, or smells burnt.
- The plug or cord shows melting or heat damage.
Step 2: Do a quick visual and reset check first
- Look for a wall switch that may control the outlet and turn it on.
- Check nearby GFCI outlets for a tripped reset button, especially in bathrooms, garages, basements, kitchens, or exterior areas.
- Press RESET on any tripped GFCI you find.
- Go to the electrical panel and look for a breaker that is tripped or sitting between ON and OFF. Reset it by switching it fully OFF, then back ON.
If it works: Any simple reset has been handled before you start testing the outlet itself.
If it doesn’t: If nothing was tripped and the outlet is still suspect, move on to testing with a plug-in tester or multimeter.
Stop if:
- A breaker trips again immediately after reset.
- You see water intrusion, corrosion, or signs of overheating around the outlet or panel.
Step 3: Test the outlet with a plug-in outlet tester
- With dry hands, plug the outlet tester fully into the outlet.
- Read the light pattern on the tester and compare it to the chart printed on the tester body.
- If the tester shows correct wiring and power, the outlet is live.
- If the tester shows no lights or an open hot condition, the outlet likely has no usable power.
- If the tester shows a wiring fault, note the fault instead of assuming the outlet is simply dead.
If it works: You now know whether the outlet has power and whether the tester sees a common wiring problem.
If it doesn’t: If the tester result is unclear, the outlet style is not compatible, or you want to confirm voltage, check it with a multimeter next.
Stop if:
- The tester indicates an open ground, reverse polarity, open neutral, or another wiring fault and you are not comfortable diagnosing wiring.
- The tester fits loosely or the outlet will not hold a plug securely.
Step 4: Confirm voltage with a multimeter if needed
- Set the multimeter to AC voltage on a range that covers standard household outlet voltage.
- Insert one probe into the shorter hot slot and the other into the longer neutral slot on a standard outlet.
- Read the display. A normal reading means the outlet is energized.
- If you get little or no voltage, test hot to ground if the outlet is grounded to help narrow down whether the issue is loss of hot or neutral.
- Remove the probes carefully without touching the metal tips.
If it works: You have a direct voltage reading from the outlet.
If it doesn’t: If you are not confident using a multimeter around live power, stop with the diagnosis you already have and call an electrician for the next step.
Stop if:
- You are unsure which meter setting to use.
- The probes cannot be inserted safely or the outlet is damaged or loose.
- You get unstable readings along with heat, arcing, or buzzing.
Step 5: Use the result to narrow down the real problem
- If the outlet has normal power and correct wiring, the heater or appliance is the more likely problem.
- If the outlet has no power, recheck the breaker and any upstream GFCI one more time.
- If only one outlet is dead while nearby outlets work, the problem may be a failed receptacle or a loose connection in that circuit.
- If several outlets are dead, the issue is more likely upstream at a reset device, breaker, or wiring connection.
If it works: You have narrowed the problem to the outlet circuit or the appliance itself.
If it doesn’t: If the pattern still does not make sense, map which outlets work and which do not before calling for service. That helps pinpoint whether the fault is local or upstream.
Stop if:
- Multiple outlets are dead and you also notice flickering lights, warm wall plates, or repeated breaker trips.
- You suspect a loose connection inside the wall or panel.
Step 6: Verify the fix in real use
- After any reset or repair, plug the heater or another known working device back into the outlet.
- Run it for several minutes the way you normally would.
- Make sure the outlet holds the plug firmly and does not get warm, buzz, or trip the breaker or GFCI again.
- If the outlet powers the device normally and stays stable, the test and fix held.
If it works: The outlet works under normal use without losing power again.
If it doesn’t: If power returns briefly and then drops out, or the breaker trips again, the problem is not solved and the circuit needs further diagnosis.
Stop if:
- The outlet, plug, or cord becomes hot.
- You smell burning, hear arcing, or see sparking.
Verify the repair
- A known working device runs from the outlet.
- The outlet tester shows power and correct wiring, if applicable.
- The breaker and any nearby GFCI stay set during normal use.
- The outlet does not feel warm, buzz, spark, or smell burnt after the device has been running.
FAQ
Can I test an outlet without a multimeter?
Yes. A plug-in outlet tester is the simplest option for a standard household outlet. It can quickly show whether the outlet has power and whether it has a common wiring fault.
Why would an outlet stop working even if the breaker is not tripped?
A nearby GFCI may be tripped, a wall switch may control the outlet, the receptacle itself may have failed, or there may be a loose connection upstream on the same circuit.
What if the outlet tester shows power but my heater still will not run?
That usually points back to the heater, its plug, or its internal safety controls rather than the outlet. Confirm by trying the heater in another known working outlet.
Is a dead outlet always a bad receptacle?
No. The receptacle may be fine but not receiving power because of a tripped reset device, a breaker issue, or a loose connection elsewhere on the circuit.
When should I call an electrician?
Call if you find burn marks, melting, buzzing, repeated breaker trips, unstable voltage readings, multiple dead outlets, or any sign of a loose or overheated connection.