Monogram Range F3 Error: Open sensor circuit
The F3 error on a Monogram range indicates the oven temperature sensor circuit is open — meaning the sensor has broken internally or its wiring has an open connection, and no resistance reading can reach the control board.
~20%
DIY Fixable
From $200
Typical Repair Cost
1–3 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. The oven cannot operate with F3 active. The control will not energize heating elements without a valid sensor reading. Cooktop burners may still function.
Can I reset the code?
No. Resetting power will not resolve F3 if the sensor or wiring is truly broken. The open circuit must be physically repaired before the oven will operate.
When to stop immediately?
Stop if you notice: You see visible burn damage to the sensor wiring near the oven cavity wall, The harness insulation appears melted or charred.
Symptoms You May Notice
Oven will not heat at all
The oven fails to produce any heat when bake or broil is selected; the control reads no temperature signal and shuts the element off immediately.
Oven shuts off within seconds of starting
The oven begins the startup sequence but shuts down almost instantly because the control cannot confirm a valid sensor reading.
Beeping with no user input
The range sounds an alarm and displays F3 without any cooking function being active.
Temperature display reads dashes or shows no value
The display shows "---" or no temperature reading instead of the current cavity temperature.
Possible Causes
Open (broken) oven temperature sensor
The internal resistance element inside the RTD probe has broken, creating an open circuit that the control reads as infinite resistance.
DIY PossibleBroken or disconnected sensor wire
One or both wires in the harness connecting the sensor to the control board has broken or pulled out of its connector terminal.
DIY PossibleCorroded sensor connector
The connector between the sensor harness and the control board has corroded contacts that prevent continuity.
DIY PossibleSafe Checks You Can Do
-
1
Power Reset
Turn off the circuit breaker for 60 seconds. Restore power and check if F3 returns.
F3 caused by a true open circuit will almost always return immediately after reset.
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2
Measure Sensor for Open Circuit
Unplug the range. Disconnect the oven sensor from its harness at the back of the oven cavity. Set a multimeter to ohms and probe the two sensor terminals. A healthy sensor reads approximately 1,080 ohms. An "OL" (over-limit) or open-circuit reading means the sensor is broken and must be replaced.
If the sensor reads OL, the sensor itself is the definitive cause — replace it.
Tools required -
3
Check Harness Continuity
If the sensor tests good (around 1,080 ohms), use a multimeter to check continuity along each wire of the harness from the sensor plug to the control board connector. A break in continuity in either wire indicates the harness must be repaired or replaced.
Pay special attention to the section where the harness passes through the oven cavity wall — this area is most prone to heat damage.
Tools required
When to Call a Professional
Contact a qualified technician if:
- Sensor and wiring harness both test good but F3 persists
- You are not comfortable working inside the range chassis with electrical components
- The control board connector shows corrosion or burn damage
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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