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Error code reference

LG Cooktop Error Code E2

Low line voltage detected.

LG codesLG cooktop codes

Low line voltage detected.

First step from the service manual

Check incoming L1 to L2 / 208~240 VAC.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E2 means on a LG cooktop

The E2 error code on an LG cooktop indicates that the unit has detected low line voltage on the incoming power supply. The cooktop's control board continuously monitors the voltage between L1 and L2, which should fall within the 208 to 240 VAC range for proper operation. When the measured voltage drops below the acceptable threshold, the control board triggers the E2 fault and interrupts normal cooking operation to protect internal components from damage caused by sustained undervoltage conditions.

The most common source of this fault is a problem external to the cooktop itself. Issues such as a weak or failing circuit breaker, loose wiring connections at the terminal block or junction box, or a utility supply problem can all cause the line voltage to sag below the required minimum. In some cases, the problem originates at the main electrical panel, where a partially tripped double-pole breaker can result in only one leg of the 240V supply reaching the appliance, producing a measured voltage significantly below specification.

Diagnosing E2 requires a calibrated multimeter to measure the actual voltage between L1 and L2 at the cooktop's terminal block while the unit is connected and powered. A reading below roughly 197 to 208 VAC (depending on the nominal supply) confirms an undervoltage condition. If the voltage at the terminal block is within spec, the control board itself may be misreading the supply, though this is a less common scenario. Always rule out upstream wiring and breaker issues before suspecting the board.

Source: manufacturer service documentation.

Common causes of E2

  1. 01

    Partially tripped or weak circuit breaker

    Part replacement

    A double-pole breaker that has partially tripped can deliver voltage on only one leg, cutting the effective supply well below 208 VAC. Check the breaker panel and fully reset or replace the breaker if it fails to hold.

  2. 02

    Loose or corroded wiring connections

    Wiring / connection

    Loose terminals at the cooktop's terminal block, the junction box, or the wall outlet can create resistance that drops the line voltage under load. Inspect all connections for tightness, heat discoloration, or corrosion.

  3. 03

    Utility supply undervoltage

    Wiring / connection

    A neighborhood-level low voltage condition from the utility provider can cause L1 to L2 readings to fall below the 208 VAC minimum. Test voltage at the panel and contact the utility if the incoming supply is consistently low.

  4. 04

    Undersized or degraded supply wiring

    Part replacement

    Wiring that is too small for the cooktop's amperage draw, or older wiring with increased resistance due to age or damage, can cause voltage to sag under load. A licensed electrician should evaluate the circuit conductors.

  5. 05

    Faulty control board voltage sensing circuit

    Part replacement

    If the incoming voltage measures within the correct 208 to 240 VAC range at the terminal block but E2 still appears, the control board's voltage sensing circuit may be defective and reporting a false fault.

See the test procedure for each cause

Frequently asked questions about E2

What does E2 mean on a LG cooktop?
The E2 error code means the cooktop has detected low line voltage on the incoming power supply. The unit monitors the voltage between L1 and L2 and expects a reading in the 208 to 240 VAC range. When voltage drops below the acceptable threshold, the cooktop halts operation and displays E2 to prevent component damage from sustained undervoltage.
How do I fix an E2 error on my LG cooktop?
Start by measuring the voltage between L1 and L2 at the cooktop's terminal block using a multimeter. If the reading is below 208 VAC, the problem is in your home's electrical supply, not the cooktop itself. Check the circuit breaker for a partial trip, inspect all wiring connections for looseness or corrosion, and contact your utility company if the supply voltage at the panel is also low. If voltage is within spec but the error persists, the control board may need to be evaluated.
Is it safe to use my LG cooktop while it shows an E2 error?
No. The cooktop disables itself when E2 is active specifically to protect its internal electronics from damage caused by low voltage. Attempting to bypass or ignore this condition could damage the control board or heating components. Resolve the underlying electrical supply issue before resuming use.
Will resetting my LG cooktop clear the E2 error?
A reset, such as turning the cooktop off and cutting power at the breaker for a few minutes, may temporarily clear the display, but the E2 code will return if the low voltage condition still exists. The fault is triggered by a real-time voltage measurement, so it will reappear each time the cooktop detects an undervoltage reading on L1 to L2.
How much does it cost to repair an LG cooktop E2 error?
The cost depends heavily on the root cause. If the issue is a faulty circuit breaker, replacement typically runs in the range of $150 to $300 including an electrician's labor. Wiring repairs or panel work can range from $200 to $600 or more depending on the scope. If the cooktop's control board is ultimately responsible, board replacement parts and labor generally fall in the range of $200 to $450.

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