LG Dishwasher: heater circuit failure
What is this symptom?
Experiencing an LG dishwasher heater circuit failure? This issue often presents as error codes like HE or HE3, indicating that the internal heating circuit is malfunctioning. As a result, your dishwasher may not heat water properly during wash or dry cycles, leading to poor cleaning performance. Understanding the causes and solutions is essential for effective troubleshooting.
Important Tips for LG Models
- Error codes HE and HE3 specifically indicate heating circuit issues on LG dishwashers
Possible Causes
Faulty heating element
How to Identify: Water remains cold after cycle; continuity test shows open circuit on heating element; visible damage or corrosion
Part: Heating element assembly
Control board malfunction
How to Identify: All heater-related components test good but dishwasher still shows heater error; no voltage to heater circuit
Part: Main control board
DIY Solutions
Test and Replace Heating Element
- Disconnect power at breaker
- Remove lower access panel and racks to access heating element
- Use multimeter to test continuity of heating element (expected low resistance)
- If no continuity, disconnect wires and replace heating element with OEM part
- Reassemble dishwasher, restore power, and test
Test and Replace Thermistor
- Cut power to dishwasher
- Locate thermistor near heating element/sump
- Measure resistance vs expected spec from service manual
- Replace thermistor if out-of-spec and retest
Inspect and Repair Heater Wiring
- Turn off power
- Inspect wiring to heating element for frayed insulation, burn marks, or moisture damage
- Perform continuity check to ground to find shorts
- Repair or replace damaged sections with proper connectors and insulation
- Reassemble and test dishwasher
Next step
Choose the next step for heater circuit failure
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Heating Element
Heats the water or air inside the appliance to the required temperature.
- Typical part-only price
- $40 - $95
- DIY difficulty
- Medium
- Estimated time
- 30-45 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Model-compatible Dishwasher parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Dishwasher Cleaner and Descaler
Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.
Braided Dishwasher Inlet Hose
For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Replace Main Control Board
Full Heater Assembly Replacement
When to Call a Professional
Preventive Maintenance
-
Clean filters and sump area: Debris buildup that can affect sensor readings and water flow
Frequency: monthly -
Inspect wiring and components for corrosion: Wiring degradation that can cause shorts or open circuits
Frequency: annually
Frequently Asked Questions
Why is my LG Dishwasher heater circuit failure?
How do I fix LG Dishwasher heater circuit failure myself?
How much does it cost to fix heater circuit failure?
When should I call a technician for heater circuit failure?
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
Common Issues Reported by Users
- Faulty heating element
- Defective control board
- Damaged wiring or connections
User Suggested Solutions
-
Test and replace the heating element if faulty. Disconnect power, access the heating element, use a multimeter to check for continuity, and replace if necessary.
-
Inspect and replace the control board if it's defective. Disconnect power, remove the control panel, check for burnt components, and replace the board if needed.
-
Check and repair any damaged wiring or connections. Inspect the wiring harness for signs of wear or damage, and repair or replace as necessary.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
Community Discussions
HE code
Replace the wash pump assembly, which includes the heater.
Source: Reddit r/appliancerepair
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