I’m working on an Electrolux ESL5201LO dishwasher that is not heating water. I already replaced the heating element, but the issue remains. When I measured voltage going to the heater, I only got about 57V AC instead of the expected 230V, even with the heater disconnected. That clearly means something upstream is wrong. If you’re facing the same issue, here’s what to check next. Quick Answer If your Electrolux dishwasher is not heating and shows low voltage to the heater, the issue is usually: Faulty control board or relay Bad wiring or connections Failed sensor preventing heater activation Step-by-step: How to fix low voltage to dishwasher heater Step 1: Understand the low voltage reading Getting 57V instead of 230V usually means: The heater is not being fully powered A control component is not switching correctly This is not a heater problem — it’s a control circuit issue. Step 2: Check the control board relay The control board sends power to the heater. Look for a heater relay on the board If faulty, it may send partial or unstable voltage This is one of the most common causes of low voltage. Step 3: Inspect wiring and connectors Electrical faults can reduce voltage. Check wires from board to heater Look for burn marks, corrosion, or loose terminals Poor connections can cause voltage drop. Step 4: Test safety components Dishwashers use safety devices that can block heating. High-limit thermostat Thermal fuse If these fail, they may interrupt full voltage supply. Step 5: Check turbidity sensor (good step) You’re already replacing this, which is smart. If faulty, it may stop heating cycle The machine may think water is already clean or hot This can prevent heater activation. Step 6: Verify heater control logic The heater only activates under certain conditions: Proper water level Correct cycle stage Valid sensor readings If any condition fails → heater gets reduced or no voltage. Step 7: Use service manual test points Service manuals usually provide: Circuit diagrams Voltage test points Component checks These help confirm whether the issue is board, wiring, or sensor-related. Extra tips and best practices Always test voltage under load when possible Use a reliable multimeter Check connectors twice before replacing parts Compare readings with service manual specs Common mistakes to avoid Replacing the heater again unnecessarily Ignoring control board faults Misinterpreting partial voltage readings Skipping wiring inspection FAQs Why is my dishwasher heater only getting partial voltage? Because the control relay or circuit is not fully engaging. Can a sensor stop the heater from working? Yes. Sensors like turbidity or temperature sensors can block heating cycles. Is low voltage always a control board issue? Most of the time, yes — especially if wiring is intact. Conclusion If your Electrolux dishwasher is not heating and only shows 57V to the heater, the problem is not the element — it’s the control system or wiring. Focus on the relay, sensors, and connections. That’s where the real issue usually is.

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