Roper Range Error Code F3: Oven Temperature Sensor Open... | appliancefaults.com

Technical Background:

The Roper range uses an electronic control board (MCU) to monitor the oven temperature. The oven temperature sensor (RTD or Thermistor) provides a variable resistance signal to the control board, which interprets this signal as the oven temperature. The F3 error code indicates that the control board is detecting an open circuit or an out-of-range resistance from the oven temperature sensor. This could be due to a faulty sensor, wiring problems, or a defective control board. The control board supplies a low DC voltage (typically 5V DC) to the sensor and monitors the return voltage. A break in the circuit will prevent the return voltage and trigger the error.

Symptoms:

The Roper range displays an F3 error code on the control panel. The oven will not heat or may not heat properly. The oven may shut down unexpectedly during a bake cycle.

Possible Causes:

Faulty oven temperature sensor (RTD or Thermistor)
Wiring harness issue between the sensor and the electronic control board
Loose connection at the sensor or control board
Damaged or corroded connector pins
Defective electronic control board
Burned wiring due to overheating

Solution:

1

Disconnect power to the range at the breaker panel. LOTO (Lock Out, Tag Out) is required.
2

Locate the oven temperature sensor inside the oven cavity, typically at the rear.
3

Disconnect the sensor wiring harness connector. Inspect the connector and wiring for damage or corrosion.
4

Using a digital multimeter, measure the resistance of the sensor. A typical RTD sensor should read around 1000-1100 ohms at room temperature (70-75°F). Refer to the service manual for the specific resistance range.
5

If the resistance is open (infinite resistance) or significantly out of range, replace the oven temperature sensor.
6

If the sensor resistance is within range, check the wiring harness between the sensor and the electronic control board for continuity and shorts. Use your multimeter set to continuity test. Repair or replace the harness as needed.
7

If the wiring and sensor test good, the electronic control board may be defective. Replacement may be necessary.

Safety Warning:

Disconnect power to the appliance at the breaker panel before attempting any repairs. High voltage (120V AC, 240V AC) is present inside the appliance. Follow LOTO procedures.

Prevention:

Avoid spills inside the oven that can lead to corrosion of the sensor and wiring. Regularly clean the oven to prevent food debris buildup. Check oven vent for blockage.

Expert Tip:

After replacing the oven temperature sensor, perform an oven calibration procedure (if available) to ensure accurate temperature readings. This is often accessed through a service mode by pressing specific button combinations on the control panel. Consult the service manual for the specific sequence for your Roper model.

Frequently Asked Questions

•What is the typical resistance range for a good oven temperature sensor at different temperatures?

The resistance of an oven temperature sensor varies with temperature. Consult the service manual or component datasheet for the resistance chart specific to your sensor type (RTD or Thermistor).

•How do I access the service mode on my Roper range?

The service mode access varies by model. Try pressing and holding the 'Bake' and 'Broil' buttons simultaneously for 3-5 seconds, or consult the service manual for the specific key sequence.

•What voltage should I expect to see at the sensor connector from the control board?

Typically, the control board supplies a low DC voltage (around 5V DC) to the sensor. Use your multimeter to check the voltage between the sensor terminals with the sensor disconnected.

Roper Range Error Code F3: Oven Temperature Sensor Open Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a good oven temperature sensor at different temperatures?

•How do I access the service mode on my Roper range?

•What voltage should I expect to see at the sensor connector from the control board?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: