Mistake. E2 Xiaomi Desktop Dishwasher: How to Reset and Fix

What's a mistake E2 And why does it appear on Xiaomi PMM?

Xiaomi's desktop dishwashers (Mi Smart Dishwasher, Viomi and others) feature a self-diagnostic system that outputs error codes when faults occur. E2 — One of the most common, and it points to problems with water heating or a TEN (tubular electric heater) malfunction, as opposed to errors. E1 (water overflow) or E3 (plum-problem), E2 directly related to the temperature of the wash.

Causes of the occurrence E2 several:

• 🔥 Failure of the TENG - burnout, chain break or short circuit.
• 🌡️ Failure of the temperature sensor (thermistor), which transmits incorrect data to the control board.
• 💧 Low voltage in the network or power surges that interfere with normal heating.
• 🔧 Filter clog or scale on the heating element, impairing heat exchange.
• 📱 Controller software failure (less commonly, but occurs after software updates).

It is important to distinguish between temporary failures (for example, due to a voltage drop) and hardware failures (temperature damage), in the first case, the error can be reset yourself, in the second case, repair or replacement of parts will be required.

How to make a mistake E2: step-by-step

If there's a mistake E2 This is the first time you've seen it, try a software reset, and it works 60 to 70 percent of the time, unless it's a physical TEN failure. It's good for all Xiaomi desktop models (including Viomi and Mijia).

Step 1: Complete power reset

1. Turn off the PMM from the plug (remove the plug).
2. Wait 10-15 minutes – this time is enough to discharge the capacitors on the control board.
3. Connect the machine back and turn it on with the power button.

Step 2: Reset via button combination (for touch-controlled models):

1. Hold the power button (🔄) for 5 seconds.


2. Without letting go, press and hold the Start/Pause button (▶️||) for another 3 seconds.




3. Release both buttons - the machine will emit an audible signal and restart.

Step 3: Starting the test cycle

• Select the Quick Wash program (usually 30-40 minutes).
• Start the cycle without dishes, adding 1 tbsp. spoonful of citric acid to clean TENS from scale.
• If the error does not appear, the problem is temporary.

Diagnostics of TEN and temperature sensor

If the reset didn't work, you need to check the heating element and the thermistor, and you need a multimeter (tester) and a screwdriver. V3 Mi Smart Dishwasher Q1 The TEN is located at the bottom of the machine under the filter.

TEN testing:

1. Disconnect the PMM from the network and drain the water through the emergency hose (if any).
2. Remove the lower cover (usually attached to 2-4 screws).
3. Disconnect the terminals from the TENG and measure resistance: 🔹 Normal resistance: 20-40 Ohms (depending on model). 🔹 The cliff (∞) or short circuit (0 ohms) - TEN is faulty.

Checking the temperature sensor (thermistor):

• The thermistor is usually located next to the TEN and is a small cylindrical element with two wires.
• Measure resistance at room temperature (~20°C): 🔹 Norm: 10–20 kΩ (for exact values see the model documentation). 🔹 0 Ohm or ∞ — sensor malfunction.

Mistake. E2 because of scale: how to clean the TEN

Scaling is a common cause of overheating of the TEN and triggering an error E2. In regions with hard water, the heating element becomes covered with lime plaque after 3-6 months of use:

• 🔥 Deterioration of thermal conductivity (TEN overheats and turns off).
• 💡 Increased washing time (machine heats water longer).
• ⚡ Increased energy consumption.

How to remove scale:

1. Citric acid: Put 100-150 g of acid in the detergent compartment. Run the Intensive wash program at 60-70°C. After the cycle, check the filter - it may contain scale particles.

Special facilities

Somat Machine Cleaner

Finish

• Follow the instructions on the package (usually 1 tablet per cycle).
• Repeat the cleaning every 2-3 months.

Scale prevention:

• 💧 Use water softeners (e.g., 3-in-1 tablets with salt).
• 🔄 Start the Cleanup program regularly (once a month.
• 🚰 Install a magnetic filter on the inlet hose (if the water is very hard).

💡

After cleaning the TENS from scale, start 2-3 "idle" cycles with detergent - this will help to wash out the residues of acid and restore the normal operation of the sensors.

Power problems and voltage surges

Mistake. E2 Xiaomi PMM is sensitive to fluctuations: if the voltage drops below 190V or rises above 240V, the control board blocks water heating as a safety measure.

How to check the voltage:

• Use a multimeter or network tester to measure the voltage in the socket.
• Normal readings: 220B ± 10% (198–242B).
• If the voltage goes beyond these limits, connect the PMM through a stabilizer (with a power of at least 2000 W).

Other electrical problems:

• 🔌 Bad contact in the socket - check if the fork is staggering.
• 🔋 Faulty network filter (if the PMM is connected via an extension cord).
• ⚡ Short circuit in the wiring of the machine (less often, but requires diagnosis).

If voltage surges occur frequently, consider installing a voltage control relay (e.g, ZUBR R16-220) or uninterruptible power supply (UPS) to protect equipment.

💡

The voltage stabilizer is a prerequisite for long-term operation of the MMM in regions with frequent power fluctuations, even minor jumps reduce the life of the TPP by 30-40%.

When repair or replacement of parts is required

If after all the manipulations, the error E2 It's still showing up, probably, a hardware problem:

• 🔧 The tan does not heat the water at all (even after resetting the error).
• 🌡️ The temperature sensor shows incorrect values (for example, the water is cold, and the machine “thinks” it is hot).
• 💥 There is a smell of smoke or smoke when working.
• 🔌 PMM knocks the machine in the shield when heated.

Cost of repair (example prices):

You can replace a TEN or a thermistor yourself if you have experience with the technology.

1. Buy the original spare part (by the model number of the PMM).
2. Remove the bottom panel and disconnect the terminals.
3. Carefully remove the old TEN/sensor and install a new one.
4. Check the tightness of seals (when replacing the TEN).

⚠️ Note: When replacing heater, do not use metal tools to clean scale - they can damage the corrosion coating. It is optimal to use plastic scrapers or chemicals.

Prevention of error E2: Tips for caring for Xiaomi PMM

To avoid recurrence of the error E2, follow these recommendations:

Regular cleaning:

• 🧼 Clean the filter after each 3-5 wash cycles.
• 🍋 Once a month, clean the TENS with citric acid.
• 🧽 Wash the squirts of sprinklers from food residues.

2. Proper detergent:

• 🧪 Use only specialized pills/powders for PMM (e.g. Finish, Somat).
• 🚫 Do not use the usual means for manual washing - it forms excess foam and scale.
• 💧 Add salt to soften water (if your model supports it).

Operational rules:

• 🔌 Do not connect the PMM through the extension cord - only directly into the socket.
• 🌡️ Do not interrupt the washing program (especially during the heating phase).
• 🔄 Then, leave the door open for the air.

⚠️ Attention: If your area has high iron water, install an additional rough cleaning filter on the inlet hose. The iron settles on the TEN as rust and speeds its failure.

FAQ: Frequent questions about the error E2