LG Cooktop E7 Error: Low supply voltage
LG cooktop error — here’s what you need to know. The E7 error code on your LG cooktop indicates low voltage detected in the power supply. This is a Medium severity issue. What Does E7 Mean on an LG Cooktop? The E7 error code means the cooktop’s internal power monitoring circuit has detected that the […]
~30%
DIY Fixable
From 50
Typical Repair Cost
30–60 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. If E7 was caused by a confirmed utility brownout that has passed, the cooktop may be used cautiously. If the cause is a wiring fault, avoid using the cooktop at full power until the circuit is inspected.
Can I reset the code?
Yes. E7 clears automatically when voltage returns to the normal range. A manual power cycle may be needed if the code latched. No reset will fix a persistent wiring fault.
When to stop immediately?
Stop if you notice: Stop using the cooktop at high power if E7 appears only during maximum load — have the circuit wiring inspected., Stop use and call an electrician if E7 appears consistently regardless of power level — a wiring fault exists..
Symptoms You May Notice
Cooktop shuts off unexpectedly during high-power cooking
The cooktop is most likely to trigger E7 under high power load — when drawing maximum current, a marginal supply voltage drops below the threshold and the board shuts down to protect the electronics.
E7 code on the display
The cooktop displays E7 and shuts off; in some cases it will resume operation automatically once the voltage rises, or it may require a manual power cycle.
Other appliances on the same electrical panel show reduced performance simultaneously
If a utility brownout is causing E7, other high-power appliances — air conditioners, refrigerators, dryers — may also show signs of reduced voltage such as slower motors or dimmed indicator lights.
Unit shuts off unexpectedly during use
The cooktop powers down mid-operation without warning as the protection circuit detects unstable power conditions and cuts supply to prevent damage.
Possible Causes
Utility brownout or low-voltage supply condition
The electricity utility's supply voltage has sagged below 210 V during a period of high demand, triggering E7 on all voltage-sensitive appliances simultaneously.
DIY PossibleLoose or corroded connection in the cooktop circuit
A loose wire connection at the circuit breaker, junction box, or cooktop terminal block introduces resistance that causes a voltage drop — most pronounced when the cooktop is drawing high current.
Requires ProfessionalUndersized circuit wiring for the cooktop's power demand
The branch circuit serving the cooktop uses wire gauge insufficient for the cooktop's rated current draw, causing a voltage sag under full load that the control board detects as a low-voltage condition.
Requires ProfessionalSafe Checks You Can Do
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1
Check if other appliances are also affected
Look around the home for signs of a utility brownout — dimmed lights, slower fans, other appliances behaving sluggishly. If other appliances are also affected, the cause is a utility supply issue outside the home.
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2
Power cycle the cooktop
Turn off the cooktop circuit breaker for 60 seconds, then restore power. If E7 was caused by a brief voltage dip that has since recovered, the cooktop will operate normally after the reset.
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3
Note when E7 appears — at startup or only under high power
If E7 only appears when running multiple zones at high power simultaneously, a voltage sag under load is likely — the circuit wiring may be undersized. If E7 appears at low power or at startup, a wiring connection fault is more likely.
When to Call a Professional
Contact a qualified technician if:
- E7 appears consistently at all power levels unrelated to utility brownout events.
- Voltage measured at the cooktop terminal block is below 216 V under load.
- Circuit rewiring or dedicated higher-amperage circuit installation is required.
Need Professional Help?
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