1. Introduction
This manual provides essential instructions for the safe and efficient operation of your Whirlpool MWF 427 SL Microwave Oven with Grill and the accompanying STM008 Steamer Accessory. Please read this manual thoroughly before using the appliance and retain it for future reference.
2. Safety Instructions
Always follow basic safety precautions when using electrical appliances to reduce the risk of fire, electric shock, injury to persons, or exposure to excessive microwave energy.
- Do not attempt to operate this oven with the door open as this can result in harmful exposure to microwave energy.
- Do not place any object between the oven front face and the door or allow soil or cleaner residue to accumulate on sealing surfaces.
- Do not operate the oven if it is damaged. It is particularly important that the oven door closes properly and that there is no damage to the: (1) door (bent), (2) hinges and latches (broken or loosened), (3) door seals and sealing surfaces.
- The oven should not be adjusted or repaired by anyone except properly qualified service personnel.
- Liquids or other foods must not be heated in sealed containers since they are liable to explode.
- Only use utensils that are suitable for use in microwave ovens.
- When heating food in plastic or paper containers, keep an eye on the oven due to the possibility of ignition.
- If smoke is observed, switch off or unplug the appliance and keep the door closed in order to stifle any flames.
- Do not overheat liquids. Overheated liquids can boil over unexpectedly.
- The contents of feeding bottles and baby food jars shall be stirred or shaken and the temperature checked before consumption, in order to avoid burns.
3. Product Overview
3.1 Whirlpool MWF 427 SL Microwave Oven
The Whirlpool MWF 427 SL is a 25-liter microwave oven featuring a grill function and an innovative Full Flat cavity design. This design eliminates the traditional turntable, allowing for larger and differently shaped dishes to be used, increasing usable space by 20% compared to conventional models.

Image: Front view of the Whirlpool MWF 427 SL microwave oven, showcasing its sleek design and digital control panel.
Control Panel Features:
- Display: Shows time, cooking settings, and program indicators.
- Function Buttons: Dedicated buttons for Microwave, Grill, Crisp, Defrost, Combi, Steam, Auto Cook, Auto Clean, Silent Mode, and Clock.
- Jet Start Button: Initiates quick cooking at full power.
- Control Knob: Used to adjust time, weight, or select programs.
- Stop Button: Stops cooking or clears settings.

Image: Angled view of the microwave oven, providing a clearer look at the control panel and the spacious interior without a turntable.
3.2 Whirlpool STM008 Steamer Accessory
The STM008 is a 3-piece steamer accessory designed for use with your microwave oven, enabling healthy steam cooking. It is BPA-free and consists of a base container, a steaming basket, and a lid.

Image: The three components of the STM008 steamer accessory laid out, showing the base, steaming insert, and lid.
4. Setup and Installation
4.1 Unpacking
- Carefully remove the microwave oven and all accessories from the packaging.
- Remove any protective film or stickers from the appliance.
- Inspect the oven for any damage. If damaged, do not operate and contact customer service.
4.2 Placement
- Place the microwave oven on a flat, stable surface, such as a kitchen countertop.
- Ensure there is adequate ventilation space around the oven: at least 10 cm at the rear, 20 cm at the sides, and 30 cm above.
- Do not block any ventilation openings.
- Keep the oven away from heat sources and strong magnetic fields.

Image: The microwave oven positioned on a kitchen counter, demonstrating appropriate placement with surrounding clear space.
4.3 Power Connection
- Plug the power cord into a grounded electrical outlet. Ensure the voltage matches the specifications of the oven (230V).
- Do not use extension cords or adapters.
5. Operating Instructions
5.1 Setting the Clock
- Press the 'Clock' button.
- Turn the control knob to set the hour. Press 'Clock' again to confirm.
- Turn the control knob to set the minutes. Press 'Clock' again to confirm.
5.2 Microwave Cooking
- Place food in a microwave-safe container inside the oven.
- Close the door.
- Press the 'Microwave' button.
- Turn the control knob to select the desired power level (e.g., 800W max).
- Press 'Microwave' again to confirm.
- Turn the control knob to set the cooking time.
- Press 'Jet Start' or 'Microwave' to begin cooking.
5.3 Grill Function
- Place food on the high grill rack (if provided) in a heat-resistant dish.
- Close the door.
- Press the 'Grill' button.
- Turn the control knob to set the grilling time (e.g., 1000W max).
- Press 'Jet Start' or 'Grill' to begin grilling.
5.4 Crisp Technology
The Crisp function, combined with the Crisp plate (sold separately or included in some bundles), ensures perfect browning on both the top and bottom of food items.
- Place food directly on the Crisp plate.
- Place the Crisp plate on the oven floor.
- Press the 'Crisp' button.
- Turn the control knob to set the cooking time.
- Press 'Jet Start' or 'Crisp' to begin.
5.5 Autocook Programs
The oven features a selection of automatic programs with predefined settings for optimal cooking results.
- Press the 'Auto Cook' button.
- Turn the control knob to select the desired program (e.g., for vegetables, pizza, etc.).
- Press 'Auto Cook' to confirm.
- The oven may prompt you to enter the food weight. Turn the control knob to adjust.
- Press 'Jet Start' or 'Auto Cook' to begin.
5.6 JetDefrost Function
The JetDefrost function allows for rapid defrosting of food items.
- Place the frozen food in a microwave-safe container.
- Press the 'Defrost' button.
- Turn the control knob to select the food type or weight.
- Press 'Jet Start' or 'Defrost' to begin defrosting.
5.7 Using the STM008 Steamer Accessory
The STM008 steamer accessory is designed for healthy steam cooking of various foods like vegetables, fish, and rice.

Image: The STM008 steamer accessory containing a meal of salmon and mixed vegetables, illustrating its use for healthy cooking.
- Assembly: Place the steaming basket into the base container.
- Water: Add the recommended amount of water to the base container (refer to the steamer's specific instructions for quantities based on food type).
- Food Placement: Place your food (e.g., chopped vegetables, fish fillets) into the steaming basket.
- Lid: Cover the steamer with its lid.
- Cooking: Place the assembled steamer inside the microwave oven. Select the 'Steam' function on the microwave or use an appropriate microwave power level and time setting. Consult the steamer's instructions or a recipe for specific cooking times.
6. Maintenance and Cleaning
6.1 Microwave Oven Cleaning
- Always unplug the oven before cleaning.
- Clean the interior and exterior surfaces with a soft, damp cloth and mild detergent.
- For stubborn stains, place a bowl of water with lemon juice inside and heat for a few minutes to loosen residue, then wipe clean.
- Do not use abrasive cleaners, steel wool, or harsh chemicals.
- The Full Flat cavity design makes cleaning easier as there is no turntable to remove.
6.2 Steamer Accessory Cleaning
- Wash the steamer components with warm, soapy water after each use.
- The STM008 is typically dishwasher safe (check specific product labeling).
- Ensure all parts are dry before storing.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Oven does not start | Power cord not plugged in; Door not closed properly; Fuse blown or circuit breaker tripped. | Ensure plug is firmly in outlet; Close door securely; Check household fuse/circuit breaker. |
| Food not cooking evenly | Improper power level or cooking time; Food not stirred or rearranged. | Adjust power level/time; Stir or rearrange food during cooking. |
| Excessive steam inside oven | High moisture content in food. | This is normal for some foods. Wipe interior after use. |
| Oven light not working | Bulb needs replacement. | Contact qualified service personnel for bulb replacement. |
8. Specifications
- Brand: Whirlpool
- Model Name: MWF 427 SL
- Capacity: 25 Liters
- Microwave Power: 800 W
- Grill Power: 1000 W
- Voltage: 230 Volts
- Material: Glass (door)
- Installation Type: Countertop
- Controller Type: Knob, Buttons
- Steamer Accessory: STM008 (3 pieces, BPA-free)
9. Warranty and Support
Your Whirlpool appliance is covered by a manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions, including warranty period and coverage details. For technical assistance, spare parts, or to schedule a service appointment, please contact Whirlpool customer support in your region. Contact information can typically be found on the Whirlpool website or in your product documentation.