Bosch SMS68M38AU D2 Specs & Support

The Bosch SMS68M38AU D2 is a freestanding dishwasher from Bosch’s Serie 4 range, offering a 12-place setting capacity, an A++ energy rating, and an AquaStop leak protection system. Its specifications indicate a quiet, efficient machine (44 dB noise level) with flexible loading options, while its support profile points to a well-established appliance with readily available spare parts and service documentation.

Key Specifications and What They Mean

The SMS68M38AU D2’s core specs define its everyday usability:

• Capacity: 12 place settings – suitable for a household of 3-4 people who cook regularly.
• Energy rating: A++ (old EU scale) – roughly 30% more efficient than an A+ model, meaning lower electricity bills over its lifetime.
• Water consumption: Approximately 9.5 liters per cycle – one of the most frugal figures for a dishwasher of this size.
• Noise level: 44 dB(A) – quieter than normal conversation, so you can run it overnight without disturbance.
• Programs: Eco 50°C, Auto 45-65°C, Intensive 70°C, Quick 45°C, and a Glass 40°C cycle.
• Drying system: Heat exchanger with Zeolith mineral (on some variants) – check the exact model suffix, as the D2 often includes this feature for better drying of plastics.

The 44 dB noise figure is particularly notable; it places the dishwasher in the ‘silent’ category, ideal for open-plan kitchens. The A++ rating, while now superseded by the new A-G scale, was the upper tier when this model was manufactured, indicating a machine designed for low running costs.

Support and Service Life

Bosch supports this model through its standard channels: the user manual is downloadable from the official website, and spare parts (spray arms, filters, heating elements, control boards) are widely available from third-party suppliers. The machine uses common Bosch components, meaning most local appliance repair technicians can service it without special training. The AquaStop system – a double-walled inlet hose with a solenoid valve – is a key support feature: Bosch guarantees against water damage from the hose for the lifetime of the appliance, which is a strong indicator of build quality and reduces the risk of costly flooding repairs.

For troubleshooting, the machine displays error codes (e.g., E15 for water in the base) that are documented in the manual. Bosch’s customer service can assist with these codes, but many common issues (clogged filters, blocked spray arms) are user-serviceable with basic tools.

How the Dishwasher Works

Like all modern dishwashers, the SMS68M38AU uses a series of cycles:

1. Pre-rinse: Cold water flushes loose food particles.
2. Main wash: Water is heated to the selected temperature (up to 70°C for intensive), mixed with detergent, and sprayed via rotating arms.
3. Intermediate rinse: Cold water removes detergent residue.
4. Final rinse: Hot water (around 65°C) with rinse aid ensures spot-free drying.
5. Drying: The heat exchanger (if fitted) condenses moisture on the cool walls, leaving dishes dry without a heating element.

The ‘Auto’ program uses sensors to detect soil level and adjusts water and temperature accordingly, saving energy on lightly soiled loads. The Eco program is the most efficient for normal loads, but it runs longer (about 3 hours) because it uses lower temperatures.

How to Choose the Right Program

Choosing the correct program extends the life of your dishes and saves energy:

• Eco 50°C: Use for normally soiled everyday loads (plates, bowls, cutlery). This is the default for most users.
• Auto 45-65°C: Use when you have a mix of lightly and heavily soiled items – the sensors adjust the cycle.
• Intensive 70°C: For pots, pans, and baking trays with baked-on food. This uses more energy and water.
• Quick 45°C: For lightly soiled, small loads that you need in a hurry (about 1 hour). It does not dry as well.
• Glass 40°C: For delicate glassware and china – lower temperature prevents clouding.

A common mistake is using the Quick program for heavily soiled pans – it will not get them clean. Conversely, using Intensive for everyday plates wastes energy. The Eco program is the best balance for most households.

Common Problems and Fixes

Owners of this model typically encounter a few issues, many of which are easy to resolve:

• Dishes not drying: Check rinse aid level and refill. Also ensure the heat exchanger (if present) is not blocked by large items.
• Water left in the base (E15 error): This indicates a leak or condensation overflow. Turn off the water supply, tilt the machine to drain the base, and check the door seal and hoses. If it persists, call a technician.
• Poor cleaning results: Clean the filters (located at the bottom of the tub) and spray arms – they can clog with food particles or limescale. Use a dishwasher cleaner monthly.
• Unusual noise: Often caused by small items (e.g., olive pits) trapped in the spray arm or pump. Remove the spray arms and check for blockages.
• Machine won’t start: Check the door is fully closed, the child lock is off, and the power cord is connected. Also ensure the water supply tap is open.

If the control panel shows a flashing error code, consult the manual’s error table. Most codes point to a specific sensor or component, but DIY repair is only recommended for simple filter/hose blockages.

Comparison with Similar Models

The SMS68M38AU D2 sits in the middle of Bosch’s Serie 4 range. Compared to the entry-level SMS25 series, it offers a lower noise level (44 dB vs 48 dB) and the Zeolith drying system (on some variants), which improves plastic drying. Compared to the higher-end Serie 6 models, it lacks features like Home Connect (Wi-Fi) and a third rack, but the core washing performance is identical. If you don’t need smart features, the Serie 4 is often the best value.

When comparing to other brands, note that Bosch dishwashers are known for their ‘Flexible’ basket systems – the SMS68M38AU has adjustable tines and a foldable cup shelf, which makes loading bulky items easier. This is a practical advantage over simpler models.

Safety and Installation Considerations

Proper installation is critical for safe operation:

• Electrical: The machine must be connected to a properly grounded outlet. Do not use an extension cord. Check the power cord for damage before each use.
• Water: Use the supplied AquaStop hose. Do not extend it. Ensure the water pressure is within the range specified in the manual (typically 0.05-1 MPa).
• Drainage: The drain hose must be looped high enough (about 60-80 cm) to prevent backflow from the sink.
• Child lock: Activate the child lock (usually by holding a button for 3 seconds) if small children are present – this prevents accidental program changes.
• Detergent: Use only dishwasher detergent, never hand-washing liquid, which causes excessive foaming and can damage the machine.

If you are not confident with electrical or plumbing connections, hire a qualified installer. Incorrect installation voids the warranty and can cause leaks or electrical hazards.

Alternatives to Consider

If the SMS68M38AU D2 is no longer in production (as is likely, given its age), consider these alternatives:

• Bosch Serie 4 (current models): Look for models with similar specs, such as the SMS46GI02G or SMS6ZCI01E, but check the new energy label (A to G).
• Other brands: Miele, Siemens, and AEG offer comparable quality, but often at a higher price. Siemens models are nearly identical to Bosch (same parent company) and share parts.
• Second-hand: The SMS68M38AU D2 is still a reliable machine; buying a used unit in good condition can be a cost-effective option, but ensure it has been properly maintained.

When buying a new dishwasher, prioritize noise level (under 46 dB), energy efficiency (A or B on the new scale), and loading flexibility. The SMS68M38AU D2’s specs set a good benchmark for what to look for.

Frequently Asked Questions

Is the Bosch SMS68M38AU D2 a good dishwasher? Yes, it is a reliable mid-range model with excellent energy efficiency and quiet operation. Its 12-place capacity suits average families, and the build quality is typical of Bosch – durable and repairable.

How do I reset the Bosch SMS68M38AU D2? To reset, press and hold the ‘Start’ button for about 3 seconds until the display shows ‘0’ or the program indicator goes off. This cancels the current cycle and drains any remaining water. If the machine is unresponsive, turn off the power at the circuit breaker for 1 minute, then restart.

What does the E15 error code mean on my Bosch dishwasher? E15 indicates water has leaked into the base tray. This is a safety feature. Turn off the water supply, unplug the machine, and tilt it backward to drain the tray. Check the door seal and hoses for leaks. If the error persists, call a technician – it could be a faulty AquaStop valve or a damaged pump.

Can I use 3-in-1 detergent tablets in this dishwasher? Yes, but you must ensure the ‘3-in-1’ option is activated in the settings (usually by holding the ‘Eco’ button for 3 seconds). This adjusts the program to optimize for tablets. If not activated, use separate detergent, rinse aid, and salt for best results.

How do I clean the filter in the Bosch SMS68M38AU D2? The filter is at the bottom of the tub. Turn the coarse filter counterclockwise and lift it out, along with the fine filter. Rinse under running water, using a soft brush if needed. Clean the spray arms by removing them and flushing with water. Do this monthly to maintain performance.

Is the Zeolith drying system worth it? If your model includes Zeolith (check the manual), it uses a mineral to absorb moisture and heat, improving drying of plastics and reducing energy use. It is a useful feature, but not essential – standard condensation drying works fine for most loads.

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