1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your new Tolxh Replacement Timer Knob. This knob is designed as a direct replacement for the timer knob on Farberware 3.2 Quart Air Fryer models, specifically FBW FT 42138 BK. Please read this manual thoroughly before attempting any installation or use to ensure safe and effective operation.
2. Safety Information
Always prioritize safety when handling appliance parts and performing installations. Failure to follow these safety guidelines may result in personal injury or damage to the appliance.
- Disconnect Power: Before attempting any installation or replacement, ensure the air fryer is unplugged from the electrical outlet.
- Handle with Care: The replacement knob is made of durable plastic, but avoid excessive force during installation to prevent damage.
- Proper Fit: Ensure the replacement knob fits securely onto the air fryer's shaft. A loose knob may not function correctly.
- Keep Out of Reach of Children: Small parts can be a choking hazard.
3. Package Contents
Your package should contain the following item:
- 1 x Tolxh Replacement Timer Knob (Black)
4. Installation
Follow these steps to replace the timer knob on your Farberware 3.2 Quart Air Fryer.
- Ensure Power is Disconnected: Verify that your Farberware air fryer is unplugged from the wall outlet.
- Remove Old Knob: Gently pull the existing timer knob straight off the control shaft. If it is stuck, a slight wiggling motion may help, but avoid excessive force that could damage the shaft.
- Inspect Shaft: Check the control shaft for any debris or damage. Clean if necessary. The shaft typically has a flat side or a D-shape to ensure proper alignment.
- Install New Knob: Align the opening on the back of the new Tolxh replacement knob with the shape of the control shaft. Push the knob firmly onto the shaft until it is seated securely.

Figure 1: Bottom view of the replacement timer knob, illustrating the D-shaped opening designed for secure shaft attachment.

Figure 2: Front view of the replacement timer knob, showing its textured grip and indicator mark.

Figure 3: Side profile of the replacement timer knob, highlighting its compact design.

Figure 4: Angled top view of the replacement timer knob, providing a comprehensive look at its surface and indicator.

Figure 5: Angled bottom view of the replacement timer knob, showing the shaft connection point from a different perspective.
Visual Installation Guide
Video 1: A 30-second demonstration showcasing the Tolxh Replacement Timer Knob from various angles, providing a visual guide to its appearance and potential fit for your appliance.
5. Operating Instructions
Once the replacement timer knob is securely installed, its operation is identical to the original knob on your Farberware 3.2 Quart Air Fryer.
- Setting the Timer: Rotate the knob clockwise to set the desired cooking time. The markings on your air fryer's control panel will indicate the time intervals.
- Turning Off: The timer will automatically turn off the air fryer once the set time has elapsed. You can also manually turn the knob counter-clockwise to the 'OFF' position if needed.
6. Maintenance
To ensure the longevity and proper function of your replacement timer knob:
- Cleaning: Wipe the knob with a soft, damp cloth. Do not use abrasive cleaners or harsh chemicals, as these can damage the plastic finish.
- Avoid Excessive Force: Do not force the knob if it feels stiff. This could indicate an issue with the air fryer's internal timer mechanism, not the knob itself.
- Regular Inspection: Periodically check that the knob remains securely attached to the shaft.
7. Troubleshooting
If you encounter issues with your replacement timer knob, consider the following:
- Knob Does Not Fit: Double-check that the model number of your air fryer matches the compatible models listed for this replacement knob. Ensure the shaft shape (e.g., D-shape) on your air fryer aligns with the opening in the knob.
- Knob is Loose: Remove the knob and re-install it, ensuring it is pushed firmly onto the shaft until it clicks or feels secure. If it remains loose, the shaft on your appliance may be worn or damaged.
- Timer Not Functioning: If the knob turns but the timer on the air fryer does not respond, the issue is likely with the internal timer mechanism of the air fryer, not the replacement knob. Consult your air fryer's original manual or a qualified technician.
8. Specifications
| Feature | Specification |
|---|---|
| Product Name | Replacement Timer Knob |
| Brand | Tolxh |
| Model Number | 5qt |
| Compatible Appliance | Farberware 3.2 Quart Air Fryer (FBW FT 42138 BK) |
| Material | Plastic |
| Color | Black |
| Product Dimensions | 1.6"L x 1.6"W |
| Item Weight | 13 Grams (0.459 ounces) |
| UPC | 767643530997 |
9. Warranty and Support
Tolxh is committed to customer satisfaction. This replacement part is manufactured to meet OEM manufacturing requirements and is functionally equivalent to the original part. If you experience any issues or are not satisfied with your purchase, please contact the seller directly through the platform where the product was purchased. Provide your order details for prompt assistance.
For further inquiries or support, please refer to the contact information provided by your retailer or the Tolxh brand's official channels.