Amana Refrigerator Error Code r1: Fridge Sensor Short... | appliancefaults.com

Technical Background:

The refrigerator's Main Control Unit (MCU) monitors the fridge thermistor's resistance to determine the fresh food compartment temperature. The thermistor acts as a variable resistor; its resistance changes with temperature. The MCU sends a low-voltage signal (typically 5V DC) through the thermistor. A short circuit in the thermistor circuit will result in an incorrect voltage reading at the MCU, triggering the r1 error code.

Symptoms:

The Amana refrigerator is displaying error code r1 on the control panel. The refrigerator may not be cooling properly, or the compressor may be running constantly. The fresh food compartment temperature may be fluctuating wildly.

Possible Causes:

Faulty fridge thermistor
Wiring harness damage (short to ground)
Control board failure (MCU)
Excessive moisture causing a short

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the fridge thermistor, usually near the evaporator coils or in the fresh food compartment. Consult the wiring diagram.
3

Disconnect the thermistor from the wiring harness. Using a multimeter set to Ohms, measure the thermistor's resistance at room temperature (approx. 77°F). Compare the reading to the service manual's temperature/resistance chart. A shorted thermistor will read close to 0 Ohms.
4

Inspect the wiring harness for any signs of damage, such as frayed wires or pinched insulation. Repair or replace the harness as needed.
5

If the wiring and thermistor are good, suspect a faulty control board. Disconnect power and visually inspect the control board for burned components.
6

As a temporary measure, try to reset the fridge by unplugging it for 5 minutes. Plug it back in and see if the error returns.
7

Replace the faulty thermistor or the control board as required.

Safety Warning:

Always disconnect the refrigerator from the power supply (unplug it or switch off the breaker) before performing any repairs. Use proper lockout/tagout (LOTO) procedures. Capacitors on the control board can hold a dangerous charge even after power is disconnected.

Prevention:

Regularly clean the refrigerator, paying attention to areas where moisture can accumulate. Ensure the door seals are in good condition to prevent excessive humidity. Inspect wiring harnesses during routine maintenance.

Expert Tip:

Some Amana models have a service mode. Refer to the service manual to enter the service mode. This mode allows you to directly monitor thermistor readings and run diagnostic tests. Often, you can force a defrost cycle to check sensor response, look for unusual behavior in the evaporator thermistor value during defrost initiation.

Frequently Asked Questions

•Where exactly is the fridge thermistor located in my Amana refrigerator?

The fridge thermistor is typically located either near the evaporator coils in the fresh food compartment or embedded within the rear wall of the fresh food section. Check your model's specific wiring diagram for the precise location. It's usually a small, cylindrical component with two wires connected to it.

•How do I access the control board in my Amana refrigerator?

The control board's location varies. Some are behind an access panel on the rear of the refrigerator, while others are located behind the control panel inside the fresh food compartment. Unplug the refrigerator and consult the service manual. Typically, you'll need a 1/4-inch nut driver to remove screws securing the access panel.

•What is the typical resistance range for a fridge thermistor at room temperature (77°F)?

While the exact value depends on the specific thermistor, a common range is between 5,000 and 10,000 Ohms at 77°F (25°C). Refer to the service manual for the correct value for your refrigerator model. A reading significantly outside this range indicates a faulty thermistor.

Amana Refrigerator Error Code r1: Fridge Sensor Short Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where exactly is the fridge thermistor located in my Amana refrigerator?

•How do I access the control board in my Amana refrigerator?

•What is the typical resistance range for a fridge thermistor at room temperature (77°F)?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: