Amana Dishwasher Error Code 7-1: Heating Element Fault... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) monitors the heating element circuit. Code 7-1 indicates an open or shorted circuit, or the inability to achieve the target temperature within a set time. The MCU sends a 120V AC signal to the heating element relay, which then energizes the heating element. Feedback from a thermistor confirms the water temperature.

Symptoms:

The dishwasher isn't heating the water, dishes aren't drying properly, the wash cycle takes longer than usual, or the dishwasher stops mid-cycle and displays error code 7-1.

Possible Causes:

Failed heating element
Faulty heating element relay on the control board
Wiring issues between the control board and the heating element
Open thermal fuse on the heating element circuit
Low voltage supply to the dishwasher
Defective control board

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the heating element, typically at the bottom of the wash tub. Visually inspect for damage.
3

Disconnect the wires to the heating element and use a multimeter to test its resistance. A typical reading is around 15-25 ohms. If open, replace the element.
4

Check the wiring harness between the control board and the heating element for continuity. Repair any breaks or shorts.
5

Locate the heating element relay on the control board. Check for burnt marks or damage. If found replace the control board.
6

Verify 120V AC to the heating element during the heating cycle using a multimeter. If no voltage is present but the control board is sending the signal, replace the control board.
7

Check the thermal fuse for continuity. If open, replace the fuse and investigate the reason for the overheat.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Use proper Lock Out Tag Out (LOTO) procedures. Dishwashers use 120V AC, which can cause serious injury or death.

Prevention:

Run the dishwasher regularly. Avoid overloading the dishwasher, as this can restrict water flow and heating efficiency. Use rinse aid to improve drying performance. Clean the spray arms regularly to ensure proper water circulation.

Expert Tip:

Some Amana dishwashers have a service mode. To access it, press and hold the “Start/Cancel” button for 5 seconds, then quickly press the “High Temp Wash” button three times. This will allow you to run diagnostic tests on the heating element and other components.

Frequently Asked Questions

•What is the correct resistance range for the heating element?

The typical resistance range for the heating element is between 15 and 25 ohms.

•How do I test the heating element relay on the control board?

To test the heating element relay, first ensure the dishwasher is disconnected from power. Then, use a multimeter to check for continuity across the relay contacts when the heating cycle is activated (typically simulated in service mode, if available). If there is no continuity when the relay should be energized, the relay is likely faulty.

•Where is the thermal fuse located and how do I replace it?

The thermal fuse is usually located near the heating element or on the wiring harness connected to it. It is a small, cylindrical component. To replace it, disconnect power to the dishwasher, locate the fuse, and disconnect it from the wiring harness. Replace it with a new fuse of the same voltage and amperage rating, ensuring proper connections.

Amana Dishwasher Error Code 7-1: Heating Element Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the heating element?

•How do I test the heating element relay on the control board?

•Where is the thermal fuse located and how do I replace it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: