Bosch Dishwasher Medium

Bosch Dishwasher Error Code E01 — How to Fix (Heater relay on main control failed)

Fix Bosch Dishwasher error code E01. Step-by-step guide to diagnose and resolve the heater relay on main control failed on Bosch dishwashers.

⏱️ Time30-60 minutes
📋 DifficultyMedium
🔧 Model(various models)
⚠️ ErrorE01

What Does Error Code E01 Mean?

Error E01 on your Bosch Dishwasher means: Bosch Dishwasher error code E01 indicates a problem with the heater relay on the main control board. This error occurs when the control board fails to send the correct signal to the heater, resulting in an inability to heat the water properly.

What You'll Need

🔧 Tools

  • Multimeter
  • Phillips
  • Torx T20 screwdriver
  • Wire connectors (for testing)

🛒 Parts

  • Heater relay

How to Fix Error E01 — Step by Step

  1. 1

    Step 1: Reset the Main Control Board

    Before attempting any repairs, try resetting the main control board by unplugging the power cord from the wall outlet and plugging it back in. This will reset the board and may resolve the issue. Wait 30 seconds before proceeding to the next step.

    💡 Pro Tip: Make sure to unplug the power cord from the wall outlet before attempting any repairs to avoid electrical shock.

  2. 2

    Step 2: Check the Heater Relay for Proper Function

    Locate the heater relay on the main control board. Use a multimeter to check the resistance of the relay coil. The resistance should be around 10-20 ohms. If the resistance is outside of this range, the relay may be faulty and needs to be replaced.

    💡 Pro Tip: Use a digital multimeter to get an accurate reading. Set the multimeter to the ohms function (Ω) and touch the leads to the relay coil terminals.

  3. 3

    Step 3: Check the Power Supply to the Heater Relay

    Use a multimeter to check the voltage at the power supply connector to the heater relay. The voltage should be around 12-24 volts DC, depending on the model of your Bosch dishwasher. If the voltage is outside of this range, the power supply may be faulty and needs to be replaced.

    💡 Pro Tip: Use a digital multimeter to get an accurate reading. Set the multimeter to the DC voltage function (VDC) and touch the leads to the power supply connector terminals.

  4. 4

    Step 4: Check the Wiring and Connections

    Check the wiring and connections to the heater relay for any signs of damage or corrosion. Use a wire connector to test the connections and ensure they are secure. If the connections are damaged or corroded, replace the wiring and connectors as needed.

    💡 Pro Tip: Use a wire connector to test the connections and ensure they are secure. If the connections are damaged or corroded, replace the wiring and connectors as needed.

  5. 5

    Step 5: Replace the Heater Relay (if necessary)

    If the heater relay is faulty, replace it with a new one. Make sure to purchase a replacement relay that is compatible with your Bosch dishwasher model. Follow the manufacturer's instructions for installation and wiring.

    💡 Pro Tip: Make sure to purchase a replacement relay that is compatible with your Bosch dishwasher model. Follow the manufacturer's instructions for installation and wiring.

When to Call a Professional

If safety is a concern at any point during the repair, or if the issue persists after attempting the above steps, contact an appliance repair service in your area. They will be able to diagnose and repair the issue efficiently and safely.

Related Bosch Dishwasher Error Codes

Error E09 Error E22

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