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

Technical Background:

The F3 error code indicates that the oven control board (MCU) is not receiving a valid signal from the oven temperature sensor (RTD). The RTD is a thermistor whose resistance changes with temperature. The MCU sends a small voltage through the RTD and monitors the voltage drop to determine the oven temperature. An open circuit means the MCU sees infinite resistance, triggering the F3 fault code.

Symptoms:

The oven is not heating, and the display shows the F3 error code. The oven might beep continuously or intermittently. The self-clean function will not operate.

Possible Causes:

Defective oven temperature sensor (RTD).
Wiring harness issue between the RTD and the control board.
Loose or corroded connector at the RTD or control board.
Faulty oven control board (MCU).

Solution:

1

Disconnect power to the range at the breaker panel. Verify 0V AC at the outlet.
2

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

Disconnect the wires from the RTD. Use a multimeter to measure the resistance of the RTD. At room temperature (70°F), it should read approximately 1080 ohms. An open circuit (infinite resistance) indicates a faulty sensor.
4

Inspect the wiring harness and connectors between the RTD and the oven control board for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
5

If the RTD and wiring appear to be good, access the oven control board (MCU). Use a wiring diagram to identify the RTD input terminals on the board.
6

With the range still disconnected from power, check the continuity of the wiring between the RTD connector at the control board and the RTD itself using your multimeter.
7

If all wiring checks out and the RTD is good, the oven control board may be faulty and require replacement.

Safety Warning:

Disconnect power to the range at the breaker panel before attempting any repairs. Use proper lockout/tagout (LOTO) procedures to prevent accidental re-energization. High voltage is present when the range is powered on.

Prevention:

Periodically inspect the oven temperature sensor and its wiring for any signs of damage or corrosion. Avoid excessive moisture inside the oven cavity.

Expert Tip:

After replacing the oven temperature sensor or the control board, run the oven through a complete bake cycle to ensure proper operation. You can also enter service mode to check sensor readings. Hold down the Bake and Broil buttons simultaneously for 3 seconds to enter the service mode. Cycle through the settings until you see the RTD temperature reading.

Frequently Asked Questions

•What is the resistance of a good RTD at 350°F?

The resistance of a good RTD at 350°F is approximately 1500-1600 ohms.

•How do I access the oven control board on this Hotpoint range?

The oven control board is typically located behind the control panel. You will need to remove the screws securing the control panel and carefully detach it to access the board.

•Can I use a generic RTD or do I need a specific Hotpoint part?

It's best to use a specific Hotpoint replacement RTD to ensure proper compatibility and accuracy. Generic RTDs may have different resistance curves, leading to inaccurate temperature readings.

Hotpoint Range Error Code F3: Oven Temperature Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance of a good RTD at 350°F?

•How do I access the oven control board on this Hotpoint range?

•Can I use a generic RTD or do I need a specific Hotpoint part?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: