mypros+
Error code reference

Whirlpool Microwave Error Code Err7

Humidity sensor PWM value out of allowed range (displayed during diagnostic test mode when pressing Meal…

Whirlpool codesWhirlpool microwave codes

Humidity sensor PWM value out of allowed range (displayed during diagnostic test mode when pressing Meal Reheat key).

MyPros+ Max

Get the full diagnostic procedure for Err7.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What Err7 means on a Whirlpool microwave

Err7 on a Whirlpool microwave indicates that the humidity sensor's PWM (pulse-width modulation) output value has fallen outside the acceptable range during a diagnostic test sequence. This error is triggered specifically when the Meal Reheat key is pressed while the unit is in diagnostic test mode, meaning it is not a fault that appears during normal cooking operation. The humidity sensor works by detecting moisture levels in the cooking cavity, converting that data into a PWM signal that the control board reads to automatically adjust cook time and power level for reheat functions.

The PWM signal the humidity sensor produces must stay within a defined range for the control board to accept it as valid. When the sensor outputs a signal too high, too low, or erratic, the control board flags it as out of range and displays Err7. This can happen because the sensor itself has degraded or failed, because the wiring harness between the sensor and control board has developed a fault, or because moisture or contamination has affected the sensor's internal components.

Since this error surfaces in diagnostic mode, it is primarily useful for technicians performing a systematic evaluation of the microwave's sensor systems. A faulty humidity sensor is the most direct cause, but connection issues at the sensor connector or control board header should also be ruled out before replacing components. The control board itself can produce this error if it is misreading an otherwise functional sensor signal, though that is a less common scenario.

Source: manufacturer service documentation.

Common causes of Err7

  1. 01

    Failed humidity sensor

    Part replacement

    The humidity sensor itself has degraded or failed, producing a PWM signal outside the acceptable range. This is the most direct cause and can be confirmed by checking the sensor's output signal during the diagnostic test.

  2. 02

    Loose or damaged wiring harness connection

    Wiring / connection

    A loose, corroded, or broken connector between the humidity sensor and the control board can cause an erratic or out-of-range PWM signal. Inspect the connector pins and harness for damage, corrosion, or incomplete seating.

  3. 03

    Moisture or contamination on the sensor

    Wiring / connection

    Grease, food residue, or excess moisture on the humidity sensor can interfere with its readings and push the PWM value out of range. Inspect the sensor surface and surrounding area for contamination.

  4. 04

    Faulty control board

    Part replacement

    If the sensor and wiring check out correctly, the control board may be misinterpreting the sensor's PWM signal. This is less common but should be considered after ruling out sensor and wiring faults.

See the test procedure for each cause

Frequently asked questions about Err7

What does Err7 mean on a Whirlpool microwave?
Err7 indicates that the humidity sensor's PWM output value is outside the allowed range, as detected during the microwave's diagnostic test mode. It is triggered when the Meal Reheat key is pressed while in diagnostic mode. The humidity sensor is responsible for detecting moisture in the cavity and adjusting reheat cooking automatically. This error typically points to a problem with the humidity sensor, its wiring, or in less common cases, the control board.
Can I fix Err7 on my Whirlpool microwave myself?
Some steps, such as inspecting and reseating the wiring harness connector at the humidity sensor, can be performed by a knowledgeable DIYer comfortable working inside appliances. However, replacing the humidity sensor or control board involves working near high-voltage components, so anyone unfamiliar with microwave safety should hire a qualified technician. Always unplug the unit and discharge the capacitor before opening the cabinet.
Is it safe to use my Whirlpool microwave when Err7 is displayed?
Err7 appears only during diagnostic test mode and is not a fault that interrupts normal cooking operation on its own. However, a faulty humidity sensor means the automatic Meal Reheat function may not work correctly or reliably. It is best to have the sensor inspected and repaired before relying on sensor-based cooking functions.
How much does it cost to repair Err7 on a Whirlpool microwave?
Repair costs depend on the root cause. A humidity sensor replacement typically falls in the range of $40 to $120 for the part, plus labor if a technician performs the work. If the control board is at fault, parts alone can range from $80 to $200 or more. A service call and diagnostic fee from a technician generally adds $75 to $150 on top of parts.
Will resetting my Whirlpool microwave clear the Err7 code?
A power reset by unplugging the microwave for a few minutes may temporarily clear the error from the display, but it will return when the diagnostic test is run again if the underlying hardware fault has not been resolved. The Err7 code reflects an actual out-of-range sensor reading, so the sensor or its wiring must be inspected and corrected to permanently clear the fault.

Related Whirlpool microwave codes

All Whirlpool microwave codes
View all 141 Whirlpool microwave codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass