Thermomix TM-31 Troubleshooting and Repair: Complete Guide for Users and Technicians
The Thermomix TM-31 is a durable food processor, much more so than other, more digital versions. However, over the years, errors such as Er-34 , Er-39 , Er-52 , or mechanical and electronic failures can appear. The reason? Wear and tear, misuse... the passage of time, after all. In this guide, you'll find a comprehensive diagnosis by code, causes, step-by-step solutions, and preventive advice, integrating information from our technicians with 40 years of repair experience, specialized blogs, forums, and official sources.
1. Diagnosis by error codes
🔹 Er‑34 – Engine blocked
This error usually indicates that the blades are stuck. The most common solution is to empty the container, disassemble, and thoroughly clean the blades and shaft. If this doesn't solve the problem, consider replacing the blade .
🔹 Er‑39 – Motor or power board fault
It could be due to a problem with the power electronics or the motor. Manually spin the rotor without a tumbler: if it runs smoothly, the fault is probably the plate; if it resists or makes noise, the fault is the motor.
🔹 Er‑52 – Loss of vessel contact
This error occurs when the contacts on the glass are dirty or wet, or the lid gasket no longer holds the glass securely in place:
- Clean the metal pins of the glass.
- Make sure the gasket fits snugly.
- Unplug and let dry for 24–48 hours if it gets wet.
- If it persists, consider replacing the glass .
🔹 OPEN – Selector incorrectly positioned or cover loose
It lights up if the selector is not in the OPEN position when turning on the machine. Make sure you fit the cover securely and turn the selector before starting.
🔹 Overheating errors (69, LOAD)
The engine needs a break: These errors appear after intensive use. It's recommended to let it cool for 15–30 minutes before using it again.
2. Faults without a specific code
🔹 Bearings blocked by moisture
Spilling liquid can rust the bearings and block the shaft. While in some cases it's possible to replace the bearings on your Thermomix TM-31, you'll likely end up replacing the motor .
🔹 Fluid leaks
Worn seals allow internal leaks, causing errors and electrical failures. It's best to replace the blade and seal, which usually restores proper operation.
🔹 Potentiometer gear wear
A common fault is that the speed selector turns without regulating the power, due to wear on the internal gear. It can be replaced. Easy, right?
🔹 Front button panel damaged
The button membrane is delicate and can easily be punctured. If it fails, spilled liquids or moisture can damage the microswitches or the board. Solution: Replace the original front panel or the adaptable front panel for the Thermomix TM-31 .
🔹 Blown fuse or burnt capacitors on board
After an electrical shock, a fuse may blow or components may be damaged. You may need to replace the appliance's power board.
🔹 Uncontrolled warming
When the machine heats up for no apparent reason, it may be due to damaged power transistors, such as the G04N60. Replacing them may solve the problem.
🔹 Insect plague
It seems unbelievable, but it is. There are cockroaches that like a little warmth. Small cockroaches can cause damage to the control board. Some users place protective mesh on the vents to prevent intruders, but... be careful of the device's internal heat!
3. Step-by-step repair guide
- Unplug the TM‑31 and let it dry if liquid has entered (24–48 h).
- Spin the rotor without a cup: detect blockages or noise.
- Cleans seals, contacts and the bottom of the glass.
- Replace wear parts: gaskets, glass, blades, potentiometer gear, fuses.
- Replace the electronic board if there is visible damage to the diodes or capacitors.
- Reassemble, test functions: spin, warm up, weigh, absence of errors.
4. Preventive maintenance
- It is advisable to clean the glass contacts periodically.
- Use the CLEAN function after cold ingredients to balance the temperature.
- Avoid continuous high-speed use; allow the engine to cool.
- Protect the vents and keep them clean to prevent overheating of internal components.
✅ Conclusion
The Thermomix TM-31 combines robustness and ease of repair. Common errors (Er-34, 39, 52) and mechanical and electronic failures have accessible solutions: cleaning, replacing seals, gears, fuses, or the board. For more advanced repairs, you can clean it, dry it, replace components, or consult specialized technicians. At Electrotodo, we have original TM-31 spare parts (seals, bowl, blades, gears, fuses) and professional advice to keep your food processor running smoothly.
Visit Electrotodo.es to find all TM-31 spare parts and ensure proper repair and maintenance of your robot.
