Error E90 in Bosch drying machine

• Error: E90
• Description: The E90 error code indicates a fault in the dryer’s electronics.
• Cause: It could be due to an issue with the control board relays, such as poor contact or cold solder joints.
• Solution: Check and, if necessary, replace the faulty relays.

Encountering the E90 error code on your Bosch dryer can be a cause for concern. However, fear not, as we’re here to guide you through resolving this issue step by step.

Identifying the Problem

The E90 error code in Bosch dryers typically points to an issue with the machine’s electronics. This may manifest as repetitive clicking sounds from the control unit, followed by an alarm, without the dryer starting its normal drying cycle.

Steps to Resolution

Checking Electronic Components

1. Thermal Fuses and Thermistors Check:
   • Start by checking the thermal fuse located on the heater duct. If it shows continuity, the fuse is fine.
   • Next, check the thermistor next to the thermal fuse. This component measures temperature and could be the cause of the error if it’s faulty.
2. Control Board Inspection:
   • If the above components are in good condition, the next step is to inspect the control board, paying special attention to the relays.
   • Look for signs of cold solder joints, especially around the relays. While not always visible, a cold solder can cause poor contact.

Diagnosing Relays

1. Testing the Relays:
   • With the control board removed, use a power supply to test the relays. Make sure to correctly identify the signal and power pins.
   • A properly functioning relay should show 0 ohms when closed. If you find resistance or unstable readings, the relay is faulty.
2. Relay Replacement:
   • If you detect a relay with poor contact, it will need to be replaced.
   • It’s important to use a replacement relay with the same specifications as the original. In this case, 9V DC relays are required.

Additional Considerations

• Component Quality:
  • Some Bosch dryers may have lower quality relays, leading to premature wear. Choose relays from reputable brands with better contact plating.
• Right to Repair:
  • The difficulty in accessing service manuals and professional tools is a common issue. The right to repair movement seeks to ensure consumers have access to the necessary information to perform repairs themselves.

Conclusion

The E90 error code on Bosch dryers might seem daunting, but with a bit of patience and the right tools, it can be resolved. Always remember to disconnect the dryer from the power source before attempting any repairs, and if you’re not confident, don’t hesitate to contact a professional.

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