LG Dishwasher Tripping the Breaker? Causes & Fix

Most Likely Cause#

An LG dishwasher that trips the breaker is leaking current somewhere it should not, and the first job is to learn which protective device is reacting — a standard breaker or a GFCI. A standard breaker trips only on a heavy overcurrent, so it points at a solid short in a high-draw part like the heating element or a pump motor. A GFCI trips on a much smaller ground leak, so it points at moisture or a hairline insulation crack long before a breaker would notice. The single most common hard fault behind a tripped breaker on these units is a heating element that has cracked and grounded.

Whatever the device, leave it off while you inspect. It is protecting the circuit from a genuine fault, and the fix is to find that fault, never to work around the protection.

Safety first: the breaker or GFCI is doing exactly its job by cutting power to a ground fault. Do not bypass it, tape it on, or relocate the dishwasher to a different circuit. Keep the power off during inspection and keep water away from every connection you open.

First: Which Device Is Tripping?#

• Standard breaker in the panel: suspect a heavy short — a grounded heating element or a shorted pump motor winding.
• GFCI outlet or breaker: suspect a small ground leak — moisture in a connector, a damp door harness, or an element just starting to crack.

Knowing this one thing tells you whether to hunt for a hard short or a moisture leak, and it saves a lot of blind testing.

What Usually Causes It#

The table ranks the causes from most to least common on LG dishwashers.

Test the Heating Element#

Because it draws the most current, the element is the first component to isolate with a meter. With the power off, disconnect the element and check for any continuity between its terminals and the dishwasher chassis. A healthy element reads open to ground; any reading means the sheath has cracked and the element is leaking, which is the fault. There is no safe repair for a grounded element — it is replaced.

Pumps and Moisture#

If the element tests clean, move to the wash and drain pump motors, checking each winding for a short to the housing — an aging motor that shorts under load will pop a standard breaker the instant it energizes. For GFCI trips especially, hunt for moisture: the door wiring harness and the lower connections are common spots where water bridges a connector and leaks just enough current to trip a ground-fault device. Dry everything, look for corrosion, and re-seal.

Component Isolation Sequence#

With the power off throughout:

1. Identify whether a standard breaker or a GFCI is tripping.
2. Test the heating element for continuity to the chassis.
3. Test the wash and drain pump motors for a short to ground.
4. Inspect wiring connectors and the door harness for moisture and corrosion.
5. Examine the control board and door interlock for burn marks or shorts.

Repair or Replace#

A dried and re-sealed connector can cost nothing; a heating element or a pump is a moderate part. A shorted control board is the expensive case, and on an older LG dishwasher a failed board is the point to weigh a repair against replacement. Because this is an electrical safety fault, it is a strong candidate for a professional diagnosis rather than guesswork — you can book a diagnostic visit to have the element, pumps, and board tested safely.

FAQ#

The questions we hear most about an LG dishwasher that trips the breaker are below.