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Error code reference

Whirlpool Microwave Error Code ERR C

Fuzzy temperature sensor error

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Fuzzy temperature sensor error – temperature not within 19°C to 41°C range.

First step from the service manual

Replace the fuzzy temperature probe.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What ERR C means on a Whirlpool microwave

The ERR C code on a Whirlpool microwave indicates a fault with the fuzzy temperature sensor, also called the fuzzy logic temperature probe. This sensor monitors the internal cavity or food temperature and feeds data to the control board to enable automatic cooking functions. When the sensor reads a temperature outside the accepted operating window of 19°C to 41°C (approximately 66°F to 106°F), the control board flags the reading as invalid and triggers ERR C to prevent incorrect automatic cooking cycles from running.

The most likely cause is a failed or failing fuzzy temperature probe itself. The probe can degrade over time due to heat cycling, moisture exposure, or physical damage, causing it to report resistance or voltage values that fall outside the expected range. A probe that has drifted out of calibration or developed an open or short circuit will consistently produce out-of-range readings that the control board cannot interpret as valid temperature data.

Less commonly, the wiring harness connecting the probe to the control board may have a loose connector, frayed wire, or intermittent break that distorts the signal. In rare cases, the control board itself may misread an otherwise functional probe signal, though this is uncommon and should be considered only after confirming the probe and its wiring are in good condition. The primary recommended diagnostic action is direct replacement of the fuzzy temperature probe.

Source: manufacturer service documentation.

Common causes of ERR C

  1. 01

    Failed fuzzy temperature probe

    Part replacement

    The probe has worn out or developed an internal fault, causing it to report temperatures outside the 19°C to 41°C valid range. Replacing the probe is the first and most likely fix.

  2. 02

    Damaged probe wiring or connector

    Wiring / connection

    A loose, corroded, or broken wire between the probe and the control board can cause erratic or out-of-range temperature readings. Inspect the harness and connectors for visible damage or poor seating.

  3. 03

    Probe exposed to extreme ambient temperature

    Wiring / connection

    If the microwave was stored or operated in an environment where the ambient temperature is below 19°C or above 41°C, the sensor may trigger ERR C without being defective. Allow the unit to return to normal room temperature and test again.

  4. 04

    Moisture or contamination on the probe

    Wiring / connection

    Grease buildup or moisture intrusion around the probe can alter its electrical characteristics and cause false readings. Inspect the probe for contamination and clean or replace as needed.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board may incorrectly interpret a valid probe signal and generate ERR C. This should only be considered after the probe and all wiring have been tested and confirmed functional.

See the test procedure for each cause

Frequently asked questions about ERR C

What does ERR C mean on a Whirlpool microwave?
ERR C on a Whirlpool microwave indicates a fuzzy temperature sensor error. The microwave's fuzzy logic temperature probe has reported a reading outside the valid range of 19°C to 41°C, and the control board has flagged this as a fault. The error typically means the probe has failed and needs to be replaced.
Will resetting the microwave clear the ERR C code?
A power reset may temporarily clear the ERR C code, but if the fuzzy temperature probe is faulty, the error will return once the microwave attempts to use the sensor again. A reset does not address the underlying hardware fault. Replacing the probe is required for a lasting fix.
Is it safe to use my Whirlpool microwave while ERR C is displayed?
Basic microwave heating functions may still operate, but automatic cooking modes that rely on temperature sensing could produce inaccurate results since the probe data is invalid. It is best to avoid using sensor-based cooking programs until the probe has been replaced to prevent undercooked or overcooked food.
How do I fix the ERR C error on my Whirlpool microwave?
The recommended first step is to replace the fuzzy temperature probe. Before doing so, check the probe's wiring harness and connectors for any visible damage, corrosion, or loose connections, as these can also cause the error without requiring a new probe. If replacing the probe does not resolve the issue, the control board should be evaluated.
How much does it cost to fix an ERR C error on a Whirlpool microwave?
If only the fuzzy temperature probe needs replacement, repair costs are typically in the range of $30 to $100 for the part, plus labor if a technician performs the work. If the control board is also involved, total repair costs can rise to the $150 to $350 range depending on the model and service rates in your area. Getting a diagnostic estimate before committing to board replacement is advisable.

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