1. Introduction and Overview
This manual provides essential information for the safe and efficient operation of your Hitachi MRO-S8X Healthy Chef Superheated Steam Oven Range. Please read these instructions thoroughly before using the appliance and keep them for future reference.
The Hitachi MRO-S8X is a versatile 31-liter oven range featuring superheated steam technology, a weight sensor, and a steam/temperature sensor for precise cooking. It offers various cooking modes including microwave, oven, grill, and steam, designed to simplify meal preparation and cleaning.
2. Safety Information
Always follow basic safety precautions when using electrical appliances to reduce the risk of fire, electric shock, or injury.
- Do not operate the oven if the door is damaged or if the seals are broken.
- Ensure proper ventilation around the appliance.
- Do not heat sealed containers in the microwave mode, as they may explode.
- Use oven mitts when handling hot dishes or components.
- Keep children away from the appliance during operation.
- Unplug the appliance before cleaning or maintenance.
3. Setup
Unpacking
Carefully remove the oven range from its packaging. Retain all packaging materials for potential future transport or service. Check for any damage during transit.
Placement
Place the oven range on a stable, level surface capable of supporting its weight. Ensure adequate clearance around the appliance for ventilation. Do not block ventilation openings.
- Internal Dimensions: Width 40.1 cm x Depth 34.4 cm x Height 21.8 cm
- External Dimensions: Width 48.7 cm x Depth 43.0 cm x Height 36.5 cm (Maximum depth with handle: 46.5 cm; Door open depth: 69.5 cm)
Power Connection
Connect the power cord to a grounded electrical outlet. Ensure the voltage matches the appliance's requirements.
4. Operating Instructions
Control Panel Overview
The control panel features various buttons and a display for selecting cooking modes, setting time, and adjusting temperature. Refer to the detailed diagram in the full manual for specific button functions.
Sensor-Based Cooking
The oven range is equipped with a weight sensor and a steam/temperature sensor. These sensors automatically calculate the optimal heating amount based on the food's weight (including the container) and detect steam and temperature to precisely control the cooking process.

Cooking Modes
- Microwave: Automatic maximum output of 1,000W. Manual settings include 800W, 600W, 500W, 200W equivalent, and 100W equivalent. Use the 'Easy Microwave Button' for quick 600W/500W manual operation.
- Oven: Features a 250°C 1-stage wide oven. The included 41x30 cm black tray allows for baking large quantities, such as 48 cut-out cookies at once.
- Grill: Ideal for browning and crisping dishes.
- Steam: For gentle cooking and reheating.
- Superheated Steam: Utilizes steam heated above 100°C to reduce excess fat and salt, promoting healthier cooking.


Automatic Menus
The oven range includes a variety of automatic menus for convenient cooking. These menus combine different heating methods (superheated steam, microwave, oven, grill) to achieve optimal results.
- Healthy Menus: Features 32 auto menus for oil-free cooking, such as Chicken Nanban, Potato Croquettes, and Stir-fried Beef with Peppers.
- Speed Menus: Offers 24 auto menus for dishes prepared in under 10 minutes, including steamed clams with sake, meat tofu, and simmered daikon radish.


5. Maintenance and Cleaning
Regular cleaning ensures optimal performance and extends the lifespan of your oven range. Always unplug the appliance before cleaning.
- Interior Cleaning: The interior side and back walls feature a bright silicone-based coating, making dirt easy to spot and remove. The flat top surface, without exposed heaters, is also easy to wipe clean.
- Table Plate: The ceramic table plate is removable and can be washed thoroughly with water.
- Exterior Cleaning: Wipe the exterior surfaces with a soft, damp cloth. Avoid abrasive cleaners.

6. Troubleshooting
If you encounter issues with your oven range, refer to the following common troubleshooting steps. For persistent problems, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Oven does not start | Power cord not properly connected; Door not closed securely; Safety switch issue. | Check power connection; Ensure door is fully closed; If a small black button on the top right corner inside the door is visible, push it in, close the door, and try again. |
| Food not heating evenly | Incorrect power level or cooking time; Food placed improperly. | Adjust settings; Ensure food is centered and not overcrowded. |
| Error code displayed (e.g., H32) | Internal malfunction. | Unplug the unit for a few minutes, then plug it back in. If the error persists, contact customer service. |
7. Specifications
Detailed technical specifications for the Hitachi MRO-S8X oven range.
| Feature | Detail |
|---|---|
| Model Number | MRO-S8X |
| Capacity | 31 Liters |
| Internal Dimensions (W x D x H) | 40.1 cm x 34.4 cm x 21.8 cm |
| External Dimensions (W x D x H) | 48.7 cm x 43.0 cm x 36.5 cm |
| Heating Methods | Microwave, Oven, Grill, Steam, Superheated Steam |
| Sensor Types | Weight Sensor, Steam/Temperature Sensor |
| Microwave Output | Auto Max 1,000W; Manual 800W, 600W, 500W, 200W equivalent, 100W equivalent |
| Max Oven Temperature | 250°C (for 5 minutes, then automatically switches to 210°C) |
| Material (Table Plate) | Ceramic |
| Product Weight | 18.6 kg |
| Annual Power Consumption | 79.3 kWh/year |

8. Warranty and Support
Warranty Information
This product comes with a manufacturer's warranty of 12 months from the date of purchase. Please retain your proof of purchase for warranty claims. The warranty covers defects in materials and workmanship under normal use.
Customer Support
For technical assistance, service, or warranty inquiries, please contact Hitachi customer support. Refer to the contact information provided in your product packaging or on the official Hitachi website.





