Heater error — wash water failed to reach target temperature
The HE error on the LG LDF5545ST indicates heater error — wash water failed to reach target temperature. This typically occurs due to faulty heating element inside the dishwasher tub. A qualified technician can usually diagnose this in 10–15 min (diagnosis only), but the steps below will help you understand the issue.
Safety Warning
This repair is recommended for certified technicians only. The diagnostic steps below can help you understand the issue before calling for service.
Common Causes of HE
- 1Faulty heating element inside the dishwasher tub
- 2Damaged thermistor giving incorrect temperature readings
- 3Control board heater relay failure
- 4Low water supply pressure preventing adequate fill for heating
How to Fix HE
- 1
Step 1
Power the dishwasher off and disconnect it
- 2
Step 2
Verify that the hot water supply valve under the sink is fully open
- 3
Step 3
Run hot water from the kitchen faucet for 30 seconds before starting the dishwasher so pre-heated water enters the tub
- 4
Step 4
Unplugged the dishwasher for 5 minutes to allow the control board to reset
- 5
Step 5
Run a normal wash cycle to test if the HE error returns
- 6
Step 6
If the error persists, call a technician to test the heating element and thermistor resistance
Tools Needed
When to Call a Technician
Error returns after power reset and hot water is confirmed — heating element or thermistor needs professional testing
Frequently Asked Questions
Common questions about LG HE error
The HE error on the LG LDF5545ST means the dishwasher water did not heat to the required temperature during the wash cycle. This is most commonly caused by a faulty heating element or a failed thermistor. Running a hot water pre-cycle from the faucet can help confirm whether the element is actually failing.
You can run cycles, but dishes will not be sanitized without proper heating. High-temperature washing is essential for killing bacteria on dishes, especially after handling raw meat. The HE error should be repaired before relying on your dishwasher for food-safe sanitization.
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