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Replacing Pressure Sensor on Whirlpool Control Board
Replacing the Pressure Sensor on a Whirlpool, Maytag, or Mana Control Board
This repair guide provides a step-by-step process for replacing the pressure sensor on a Whirlpool, Maytag, or Mana control board. The replacement procedure is similar for numerous control boards and can be used to fix issues such as failing to drain properly, shutting off randomly, or constantly running the drain pump.
Tools Needed
- Soldering iron
- Desoldering pump (with heating element)
- Solder wire (low temp with rosin core)
- Needle nose pliers
- Helping hands (optional)
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Identifying the Pressure Sensor and Desoldering the Pins
The pressure sensor is located on the underside of the control board, with eight pins that need to be desoldered. Some boards may have a light layer of conformal coating, which can be removed using a hot air desoldering tool or a solder gun.
Each pin needs to be desoldered individually, taking care not to damage the surrounding components. The desoldering process can be time-consuming and requires patience.
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Extracting the Old Pressure Sensor
Once all the pins are desoldered, carefully lift out the old pressure sensor from the control board. Be careful not to touch any of the components on the board.
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Installing the New Pressure Sensor
The new pressure sensor should be properly oriented and seated in the designated slot on the control board. Make sure it is securely fastened using the needle nose pliers.
Solder the three solder points on the bottom of the sensor to the control board, taking care not to touch any other pins or components. Use a low temp solder wire to avoid damaging the sensor's internal contacts.
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Reassembling and Testing the Control Board
Once the new pressure sensor is installed, reassemble the control board by plugging in the seven wires. Power on the washing machine to test the repair.
The unit should complete a normal cycle without any issues. If the repair was successful, the sensor will provide feedback to the processor, and the machine will shut off correctly during the fill state.
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Verifying the Repair
To verify that the repair was successful, use a multimeter to test the voltage going from pin three to four on the sensor during operation. The proper voltage should be around 0.3 to 0.4 volts during autosense filling.
Alternatively, run a normal load of clothes and machine to confirm that the unit fills to an appropriate non-deep fill level.
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Applying Conformal Coating (Optional)
If desired, apply a light coat of conformal coating to the rear side of the control board where the pins were soldered. This will help protect the board from moisture damage.
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| What is a Pressure Sensor? |
A pressure sensor is a device that measures the pressure of a gas or liquid in a system. It converts the physical pressure into an electrical signal that can be read by a computer or other electronic device. |
| Background |
The first pressure sensors were developed in the late 19th century, with the invention of the Bourdon tube pressure gauge. This mechanical device used a curved tube that uncoiled as pressure increased, causing a needle to move on a dial. Modern pressure sensors use a variety of technologies, including piezoelectric, capacitive, and strain gauge sensors. |
| Types of Pressure Sensors |
There are several types of pressure sensors available, each with its own strengths and weaknesses. These include: |
| Piezoelectric Pressure Sensors |
Use a piezoelectric material that generates an electric charge in response to changes in pressure. |
| Capacitive Pressure Sensors |
Use a capacitor that changes capacitance in response to changes in pressure. |
| Strain Gauge Pressure Sensors |
Use a strain gauge that changes resistance in response to changes in pressure. |
| Applications of Pressure Sensors |
Pressure sensors are used in a wide range of applications, including: |
| Industrial Automation |
To monitor and control pressure in industrial processes. |
| Aerospace |
To measure air pressure, fuel pressure, and other critical pressures in aircraft and spacecraft. |
| Medical Devices |
To measure blood pressure, intraocular pressure, and other vital signs. |
Replacing Pressure Sensor on Whirlpool Control Board |
| Introduction: |
The pressure sensor on a Whirlpool control board plays a crucial role in monitoring and regulating various functions, such as water pressure and temperature. Over time, the sensor can become faulty or damaged, leading to issues with the appliance's performance. In this article, we will guide you through the process of replacing the pressure sensor on your Whirlpool control board. |
| Symptoms of a Faulty Pressure Sensor: |
If your Whirlpool appliance is experiencing any of the following symptoms, it may be due to a faulty pressure sensor:
- Erratic or inconsistent performance
- Inaccurate temperature readings
- Leaks or water damage
- Unusual noises or vibrations
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| Tools and Materials Needed: |
To replace the pressure sensor, you will need:
- A new pressure sensor compatible with your Whirlpool control board
- Torx screwdriver (for removing screws)
- Phillips screwdriver (for removing clips or connectors)
- Pliers and wire strippers (for working with wires)
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| Step-by-Step Replacement Procedure: |
- Disconnect power to the appliance by unplugging it or switching off the circuit breaker.
- Remove the screws and clips that hold the control board cover in place. Gently lift the cover to access the pressure sensor.
- Locate the pressure sensor, which is usually connected to a small PCB (Printed Circuit Board) or wire harness.
- Carefully disconnect the wires from the faulty pressure sensor using pliers and wire strippers. Take note of the wiring configuration for later reference.
- Remove any screws, clips, or connectors that hold the faulty pressure sensor in place. Gently lift the sensor out of its housing.
- Install the new pressure sensor by reversing the steps above. Ensure it is securely fastened and connected to the correct wires.
- Reassemble the control board cover and reattach any screws, clips, or connectors you removed earlier.
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| Troubleshooting Tips: |
If you encounter any issues during the replacement process:
- Consult your user manual or manufacturer's instructions for specific guidance.
- Verify that all connections are secure and not loose.
- Check for any signs of water damage or corrosion on the control board or surrounding components.
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| Conclusion: |
Replacing the pressure sensor on your Whirlpool control board can be a relatively straightforward process if you have the right tools and follow the correct steps. Remember to take necessary safety precautions and consult professional help if you are unsure or uncomfortable with any aspect of the replacement procedure. |
| Q1: What is the purpose of the pressure sensor on the Whirlpool control board? |
The pressure sensor monitors the water pressure in the washing machine and sends signals to the control board to regulate the wash cycle. |
| Q2: Why do I need to replace the pressure sensor on my Whirlpool control board? |
The pressure sensor may need to be replaced if it becomes faulty or damaged, causing issues with the wash cycle, such as incorrect water levels or poor washing performance. |
| Q3: What are the symptoms of a faulty pressure sensor on Whirlpool control board? |
Symptoms may include incorrect water levels, poor washing performance, error codes on the display panel, or the machine not turning on at all. |
| Q4: Can I replace the pressure sensor myself, or do I need a professional? |
If you have basic DIY skills and follow proper safety precautions, you can attempt to replace the pressure sensor yourself. However, if you're unsure or uncomfortable with the process, it's recommended to hire a professional appliance technician. |
| Q5: What tools do I need to replace the pressure sensor on my Whirlpool control board? |
You'll typically need a screwdriver (preferably Torx), pliers, and possibly a wrench or socket set. It's also recommended to have a replacement pressure sensor compatible with your Whirlpool model. |
| Q6: How do I access the pressure sensor on my Whirlpool control board? |
Accessing the pressure sensor usually involves removing the top panel or rear cover of the washing machine, depending on the model. Consult your user manual or online resources for specific instructions. |
| Q7: What are the steps to replace the pressure sensor on my Whirlpool control board? |
The general steps include disconnecting the electrical connector, removing any mounting clips or screws, pulling out the old sensor, and installing the new one in reverse order. Consult your user manual or online resources for specific instructions. |
| Q8: Can I use a universal pressure sensor replacement on my Whirlpool control board? |
No, it's recommended to use a replacement pressure sensor specifically designed and compatible with your Whirlpool model to ensure proper function and avoid potential damage. |
| Q9: How do I test the new pressure sensor on my Whirlpool control board? |
After replacing the pressure sensor, run a diagnostic cycle or a normal wash cycle to verify proper function. Check for correct water levels and error-free operation. |
| Q10: What if I replace the pressure sensor but still experience issues with my Whirlpool washing machine? |
If you've replaced the pressure sensor and still encounter problems, it may indicate a more complex issue or another faulty component. In this case, consult your user manual or contact a professional appliance technician for further assistance. |
| No. |
Pioneers/Companies |
Contribution |
| 1 |
iFixit |
Provided detailed repair guides and replacement parts for Whirlpool control board pressure sensors. |
| 2 |
ApplianceBlog |
Offered step-by-step instructions and troubleshooting tips for replacing pressure sensors on Whirlpool control boards. |
| 3 |
RepairClinic |
Supplied replacement pressure sensors and provided repair guides specific to Whirlpool control board models. |
| 4 |
YouTube (various creators) |
Published video tutorials and DIY guides on replacing pressure sensors on Whirlpool control boards, showcasing different methods and techniques. |
| 5 |
Whirlpool Corporation (official support) |
Provided official repair documentation, troubleshooting guides, and replacement parts for authorized service providers and customers. |
| 6 |
AppliancePartsPros |
Specialized in providing genuine and aftermarket replacement parts, including pressure sensors, for Whirlpool control boards. |
| 7 |
FixitClinic |
Offered repair services, including pressure sensor replacement, for Whirlpool control boards, and provided online resources and guides. |
| 8 |
Electronics Repair Guide (ERG) |
Published detailed repair guides, including schematics and diagrams, for various Whirlpool control board models. |
| 9 |
ApplianceJunk |
Provided DIY repair guides, tutorials, and resources specifically for replacing pressure sensors on Whirlpool control boards. |
| 10 |
Instructables (various authors) |
Published user-generated tutorials and guides on repairing and replacing pressure sensors on Whirlpool control boards, often with creative solutions and workarounds. |
| Component |
Description |
Location |
| Pressure Sensor (PS) |
A piezoresistive pressure sensor that measures the water level in the tub. |
Mounted on the control board, near the center of the PCB. |
| IC1 (Analog Front-End IC) |
An integrated circuit responsible for signal conditioning and amplification of the pressure sensor's output signal. |
Located adjacent to the pressure sensor, on the control board PCB. |
| R1-R4 (Resistors) |
A set of resistors that form a voltage divider network to bias the pressure sensor and provide a reference voltage for IC1. |
Located near the pressure sensor, on the control board PCB. |
| C1-C4 (Capacitors) |
A set of capacitors that filter the output signal from the pressure sensor and provide decoupling for IC1. |
Located near IC1, on the control board PCB. |
| J1 (Pressure Sensor Connector) |
A 3-pin connector that connects the pressure sensor to the control board. |
Located on the edge of the control board PCB, near the pressure sensor. |
**Replacement Procedure:**
| Step |
Description |
| 1. Disconnect Power |
Unplug the appliance from the mains supply to prevent any accidental start-ups. |
| 2. Remove Control Board Cover |
Take out the screws that hold the control board cover in place, and gently lift it off. |
| 3. Disconnect Pressure Sensor Connector (J1) |
Carefully pull the pressure sensor connector (J1) off its socket on the control board PCB. |
| 4. Remove Old Pressure Sensor |
Gently pry the old pressure sensor out of its mounting bracket, taking care not to damage any surrounding components. |
| 5. Install New Pressure Sensor |
Mount the new pressure sensor into the bracket, ensuring it is securely fastened with the provided screws or clips. |
| 6. Reconnect Pressure Sensor Connector (J1) |
Connect the pressure sensor connector (J1) back to its socket on the control board PCB. |
| 7. Replace Control Board Cover |
Put the control board cover back in place, and secure it with the screws you removed earlier. |
| 8. Reconnect Power |
Plug the appliance back into the mains supply. |
**Troubleshooting:**
| Symptom |
Cause |
Remedy |
| No water level detection |
Faulty pressure sensor or IC1. |
Check the pressure sensor and IC1 for any signs of physical damage. If damaged, replace them with new ones. |
| Inaccurate water level readings |
Incorrect installation of pressure sensor or faulty calibration. |
Verify that the pressure sensor is installed correctly and calibrated according to the manufacturer's instructions. If necessary, recalibrate the sensor. |
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