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Maytag•Smart Microwave

Analysis by Lukas & Team

Maytag Smart Microwave ERR B Error: Weight Sensor Troubleshooting

Troubleshoot a Maytag Smart Microwave ERR B weight sensor error. Diagnosis and repair guide for Canadian homeowners in urban environments.

Frequently Asked Questions

•What are the specific voltage ranges I should see from the weight sensor when testing with a multimeter?

VCC should read 5V DC +/- 0.2V. The signal voltage should vary based on the weight applied. With no weight, it should read approximately 2.5V. As weight is added, the voltage should increase linearly up to a maximum of approximately 4.5V.

•Where can I find the service manual for my Maytag Smart Microwave model?

Service manuals are often available online through appliance parts retailers or technical documentation websites. Search using the full model number of your microwave.

•What type of weight sensor is used in this microwave, and can it be replaced with a generic load cell?

The Maytag Smart Microwave typically uses a strain gauge load cell. While generic load cells exist, using a non-OEM part may lead to inaccurate readings or incompatibility. It is recommended to use an OEM or exact replacement part.

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About Lukas & Team

Lukas leads the technical research department at Digital Home Faults. Together with a team of systems analysts, he specializes in translating complex manufacturer error codes into actionable diagnostic steps for the Canadian market.

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Expert Tip:

Some Maytag microwaves have a hidden service menu accessible by pressing a specific sequence of buttons (Consult the service manual for the exact sequence). This menu may allow for recalibrating the weight sensor or performing a factory reset, potentially resolving the 'ERR B' error without component replacement.

Step-by-Step Fix:

1

Disconnect the microwave from the power supply (breaker lockout). Ensure the voltage is 0V AC before proceeding.
2

Access the weight sensor located beneath the turntable. Remove the turntable and associated support structure.
3

Inspect the wiring harness and connector for damage, corrosion, or loose connections. Reseat the connector.
4

Using a multimeter, measure the voltage on the VCC and Signal wires with the microwave plugged in (carefully, observing safety precautions). VCC should be 5V DC +/- 0.2V. Signal voltage should vary based on applied weight. No weight should read approximately 2.5V.
5

If VCC is missing or the Signal voltage is erratic, replace the weight sensor.
6

If VCC is present and the Signal voltage is stable but the error persists, the main control board may be faulty and require replacement.
7

After repairs, reconnect the microwave, power it on, and verify that the 'ERR B' code is cleared. Perform a calibration cycle, if available in the service menu.

Technical Overview:

The Maytag Smart Microwave utilizes a load cell coupled with a pulse width modulated (PWM) signal processor to determine food weight. 'ERR B' indicates the PWM signal from the weight sensor is outside the acceptable range (0.5V - 4.5V DC). The sensor is connected to the main control board via a four-wire harness: VCC (5V DC), GND, Signal, and a shield. Data is transmitted via Wi-Fi (2.4 GHz IEEE 802.11 b/g/n) to the Maytag cloud for smart features. A failed sensor, harness, or control board can generate this error.

Why This Happens:

Defective weight sensor (load cell failure).
Damaged wiring harness or connector to the weight sensor.
Contamination on the load cell affecting readings (e.g., food spillage).
Main control board failure (PWM signal processor malfunction).
Firmware corruption affecting sensor interpretation.
Environmental factors: Extreme temperature fluctuations causing sensor drift (Canadian winters).

Preventative Care:

Clean the microwave interior regularly to prevent food spillage from contaminating the load cell.
Avoid placing excessive weight on the turntable.
Check for firmware updates via the Maytag app regularly.
Consider a surge protector to protect the microwave from power surges (common in Canadian storms).
During extended periods of non-use (e.g., vacation), disconnect the microwave from the power supply.