Hotpoint Microwave Error F3

⚡ Quick Answer: The Hotpoint Microwave F3 error indicates a malfunction in the sensing circuits, often linked to a faulty temperature or humidity sensor. This error t... ✅ DIY Fixable

What Does Error F3 Mean?

The Hotpoint Microwave F3 error indicates a malfunction in the sensing circuits, often linked to a faulty temperature or humidity sensor. This error typically prevents the microwave from starting or causes it to stop during sensor cook or reheat cycles. Users may also hear unusual humming sounds when attempting to use the appliance. To address this issue, a visual inspection or reset may help, but persistent errors usually require further diagnosis and potential replacement of the sensor or control board.

Common Symptoms:

  • Microwave will not start or stops with F3 displayed, especially during sensor cook or reheat cycles.

Possible Causes

  • Faulty or shorted temperature/humidity sensor or sensor cook probe (medium)
  • Wiring harness short between sensor and control board (medium)
  • Control board sensor input failure (low)

How to Fix Error F3

DIY Fix Initial Reset & Visual Inspection

  1. Unplug the microwave from power completely for ~10 minutes to clear transient errors.
  2. After unplugging, inspect for obvious damage or debris near vents and sensor grill areas (if accessible).
  3. Plug back in and attempt a basic cook cycle to see if F3 reappears.

Technician Only Sensor and Wiring Diagnosis & Replacement

  1. Verify correct service manual and part resistance specs for the temperature/humidity sensor.
  2. Measure sensor resistance at room temperature and check for proper change with heat (or replace with known-good sensor).
  3. Inspect wiring harness continuity between sensor and main control board; repair or replace damaged wiring.
  4. Replace sensor assembly with manufacturer‑specified part if readings are out of spec.
  5. If sensor and wiring check out, test control board sensor input circuitry for faults and replace board if necessary.

Parts needed: Temperature/Humidity Sensor, Wiring Harness, Control Board (if required)

🛑 When to Call a Pro:
  • If error persists after reset and basic inspection.
  • If internal inspection involves opening microwave cabinet without proper training.

Next step

Choose the next step for F3

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

Typical part-only price
$20 - $120
DIY difficulty
Medium
Estimated time
30-90 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Main Control Board

The central brain of the appliance that controls all components, cycles, and timings.

$120 - $280 · Medium · 20-40 mins

Check fit & price
Model number required

Model-compatible Microwave parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Technical Specifications

wattage 1000W
component Magnetron
resistance Less than 1 ohm
part_number WB27X10928
voltage_rating 120V AC

Common Questions

What does F3 error mean on Hotpoint Microwave?

F3 indicates a malfunction in the sensing circuits, often due to a faulty temperature or humidity sensor.

Can I fix Hotpoint Microwave F3 error myself?

Yes, you can try resetting the microwave and visually inspecting for damage or debris.

How much does it cost to fix F3 error?

Sensor parts are typically low to moderate in cost, while control board replacements are more expensive.

When should I call a technician for F3?

Call a technician if the error persists after a reset or if internal inspection is needed.

Data last verified: 2026-07-22

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