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Error E1 Heater Bosch

error e1 heater bosch

What is the fault of Bosch E1 error affecting your heater?

If you're in cold weather, you've probably turned on your Bosch water heater at home and noticed that the E1 error code is displayed on the screen. Water heaters are very useful and necessary appliances at home, especially on cold days.

The E1 error code in Bosch heaters indicates that there may be a problem with the temperature sensor, which has detected an excessively hot water outlet. The temperature sensor is responsible for measuring the water temperature coming out of the heater and adjusting the burner power to keep it constant.

If the sensor detects a temperature that is too high, the heater automatically shuts off to prevent damage or the risk of burns. In other words, it stops its operation and displays the E1 error code for safety measures. This is what the E1 error code on your Bosch heater indicates: excessively hot water causing the heater to stop.

But what causes this error to appear on my heater? There are several possible causes that can lead to a temperature sensor failure and the display of the E1 error code. Some of them include:

  • Poor installation or connection of the sensor.
  • Dirt or corrosion on the sensor or its contacts.
  • Obstruction or leakage in the heater's water circuit.
  • Insufficient or irregular water pressure or flow.
  • Poor thermostat regulation.
  • Fault in the heater's electronic PCB board.

How to fix Bosch water heater error E1?

When the E1 error code appears, the first thing you should do is check if the water is really very hot or if it is a false positive. These are the possible solutions that you can apply to solve this problem with your heater:

  1. Wait for the heater to cool down: If the E1 error code is activated on your heater, all you need to do is turn it off and wait for it to cool down. Let it rest for a while, and when it's cool, try turning it on again and check if the error code has disappeared.
  2. Restart the heater to reset the sensors: If you have allowed the heater to cool down and the problem persists, let's try restarting the heater. To do this, you'll need to turn it off completely and disconnect it from the power outlet for a few minutes (at least 15 minutes). Reconnect your heater, turn it on, and check if the error code has disappeared.
  3. Check and clean the temperature sensor and its electronic contacts: Use an electronic cleaner and locate your heater's temperature sensor. Carefully disassemble the sensor and clean it with a little electronic cleaner. Also, check that the cables and connections of this sensor are in good condition and securely attached.
  4. Check and repair the water circuit of the heater: Verify that there are no obstructions, leaks, dirt, or air in the pipes, filters, valves, or water taps of your heater. Also, ensure that the water pressure and flow are adequate and constant. If your heater does not receive enough water to operate, it may overheat and cause these types of errors.
  5. Adjust the thermostat of your heater: Set the thermostat to an appropriate temperature, between 40°C and 60°C, and adjust the water flow to an optimal level, between 8 and 12 liters per minute. These elements are located on the front of the heater and can be adjusted with a screwdriver. Consult the manufacturer's manual if you have any doubts about how to perform this procedure and verify the correct values to adjust for your heater model.
  6. Replace the electronic PCB board of the heater or perform preventive maintenance: If none of the above solutions work, the electronic board may be damaged and not sending signals correctly to the temperature sensor. In this case, thoroughly check it with a multimeter to verify its operation. Ensure that it does not have bulging or sulfated components. Perform preventive maintenance with electronic cleaner and a soft-bristle brush. In a very extreme case, you may need to replace the board with a new one of the same model and brand.
  7. Repeat all the previous steps if the problem persists: If after performing all the checks and repairs, the E1 error code continues to appear, you can conduct a second check of everything described above. This is to ensure that you have followed all the steps to the letter and have not overlooked anything.
  8. Seek help from Bosch technical support to solve the problem: If none of the above solutions work, don't discard your heater. In this case, it is advisable to contact the official Bosch or Junkers technical support for a qualified professional to inspect the heater and repair it if necessary.

In summary, the E1 error code indicates that the temperature sensor detects a very hot water outlet and turns off the heater for safety reasons. The possible causes of this error are poor installation or connection of the sensor, dirt or corrosion on the sensor or its contacts, an obstruction or leak in the water circuit, insufficient or irregular water pressure or flow, poor regulation of the thermostat or water flow or a fault in the PCB electronic board.

As we have already detailed, there are many reasons why this problem could arise, but here are the summarized solutions that you can apply to fix this failure so you can continue using your heater:

  • Wait for the heater to cool down
  • Restart the heater to reset the sensors
  • Check and clean the temperature sensor and its electronic contacts
  • Check and repair the heater water circuit
  • Adjust your heater thermostat
  • Change the heater's PCB electronic board or perform preventive maintenance
  • Repeat all the previous steps if the problem persists
  • Going to Bosch technical support can help you solve the problem

And that's all for today friend! We really hope we have been able to help you with this problem that occurs with your heater. Remember that keeping your heater up to date with preventive maintenance can avoid these types of uncomfortable situations and also prolong the useful life of your appliance. Good luck and thanks for reading this far!

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