A dishwasher that repeatedly trips its circuit breaker isn’t just inconvenient — it’s a sign that the appliance is drawing more current than the circuit can safely supply, or that an internal component has developed an electrical fault. Understanding which scenario you’re in determines whether this is a simple fix or a repair call. This guide covers every cause, in order of likelihood, so you can diagnose and resolve the problem.
Tricity Repairs serves Coquitlam, Port Coquitlam, and Port Moody for all dishwasher repairs.
Dishwasher Electrical Basics
Dishwashers in Canadian homes are typically wired on a dedicated 15-amp or 20-amp circuit at 120V. When the dishwasher draws more current than the circuit allows — either because a component is malfunctioning or because there’s a wiring fault — the breaker trips to protect the circuit. A breaker that trips once and resets is not necessarily a problem; a breaker that trips every cycle, or trips immediately when you start the dishwasher, indicates an ongoing fault.
Common Causes
1. Failing Heating Element
The dishwasher heating element heats water during the wash cycle and heats air during the drying phase. A failing element can develop a short to ground — where current flows through the element casing rather than through the heating coil — causing a sudden current spike that trips the breaker. This type of trip typically occurs once the element heats up, 15–20 minutes into a cycle rather than at startup. Heating element failure is the most common electrical fault in dishwashers. For related issues, see: Dishwasher Not Draining? Troubleshooting Guide.
2. Faulty Wash Motor or Circulation Pump
The wash motor circulates water through the spray arms. When it begins to fail — from worn windings, seized bearings, or debris jamming the impeller — it draws significantly more current than normal on startup or during operation. Motor overloads are a leading cause of breaker trips at the beginning of the wash cycle. If you hear the dishwasher hum briefly then the breaker trips, the motor is the likely culprit.
3. Water Ingress into Electrical Components
Dishwashers are wet environments, and any leak that allows water to reach wiring, the control board, or the motor can create a short circuit that trips the breaker. This is particularly common after a door seal failure or a spray arm leak that directs water where it shouldn’t go. If the trip started immediately after a visible water leak, trace the leak path to see what electrical components are in the drip zone. For door-related issues, see: Dishwasher Leaking from the Bottom: Causes and Fixes.
4. Faulty Door Latch Switch
The door latch includes a safety switch that confirms the door is closed before allowing the cycle to begin. A faulty switch can make and break the circuit intermittently — causing arcing at the switch contacts, which can trip the breaker. This typically manifests as a trip right at the start when the door is latched and the machine initializes.
5. Control Board Fault
The control board manages all electrical functions in the dishwasher. A failing relay on the board can stick closed — continuously powering a component that should be off — or cause voltage spikes that trip the breaker. Control board faults are generally diagnosed after ruling out the heating element, motor, and wiring as causes.
6. Shared or Overloaded Circuit
The dishwasher should be on a dedicated circuit. In some older homes, the dishwasher and garbage disposal share a circuit, or the dishwasher is wired into a kitchen counter circuit. If another appliance on the same circuit is running simultaneously, the combined draw can exceed the breaker’s rating. Check your electrical panel label to confirm the dishwasher has its own breaker.
7. Weakened Circuit Breaker
A breaker that has tripped many times can weaken and trip at lower-than-rated current. If the dishwasher tests normal but the breaker trips anyway, have a licensed electrician inspect and replace the breaker itself.
What to Check First
Note exactly when the trip occurs: at the start of the cycle (motor or door switch), partway through (heating element), or sporadically (control board or loose wiring). This timing narrows the cause significantly. Also check for any signs of water under or inside the door panel — water in electrical components is always the priority diagnosis. For a broader guide to appliance error codes, see: The Ultimate Appliance Error Code Cheat Sheet.
When to Call a Technician
Dishwasher electrical faults — particularly heating element shorts, motor failures, and water-damaged wiring — require testing with a multimeter and accessing internal components. Tricity Repairs serves Coquitlam, Port Coquitlam, and Port Moody. Call us at (604) 359-5952 for dishwasher electrical diagnosis and repair.
Summary
A dishwasher tripping the breaker is most often caused by a failing heating element (trip mid-cycle), a failing wash motor (trip at startup), or water reaching electrical components. The timing of the trip tells you where to look. Shared circuits and weakened breakers are simpler causes worth eliminating first before opening the appliance.