Question about Bosch 30 in. NET7452UC Electric Cooktop

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NET7452UC Electric Cooktop shows errors 26 and 42. What do they mean?

What do error codes Er 26 and Er 42 mean?

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The capacitor is 470uF, 25 volt. Replace it with 470uF 35volt and remember to observe polarity. You will need a good soldering iron to be able to flow the solder thru the eyelets on the PCB.

Posted on Nov 16, 2012

  • John Hanna Jan 28, 2014

    My two 470 uF cacitors looked and measured good with a analog ohmmeter but I changed them anyway and the error code problem is now fixed;

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Problem: Error codes 26 or 42 after turning on too many heating elements.
Potential issue: Damaged main electronic board


Specific case: Error code 42 after turning on more than 3 elements, then already after 2, 1 until none of the cooking element could be turned on, over a period of a few weeks.
Root cause: Dying/blown electrolytic capacitor on the main electronics board.


Solution:
1) Turn off power (circuit breaker) - caution high voltage inside the cooktop
2) Lift the cooktop out of the hole in the countertop and slide it on a flat surface
3) Remove all screws around the metal housing using a torx screwdriver
4) Carefully tilt the glass top out of the housing on the front, noting that there are electrical connections in the rear, and place the rear end of the glass on a stable surface. You may need someone's assistance here.
5) After double-checking that there is no power, record the color coding of the four wires connected to the glass assembly (green for ground, white, black, red from left to right)
6) Next open the black plastic cover by removing four Torx screws.
7) Carefully remove from the connector on the left the the plastic strip connecting to the display board.
8) Carefully remove the circuit board with relays and capacitors that is held in place by plastic tabs.
9) If one of the capacitors is bulging out or showing sings of damage on top, replacing it may fix the appliance. De-soldering a bad capacitor requires some tools and skill. Replace the capacitor with at least the same capacity, voltage and use high-temp. 105C version) Alternatively, instead of replacing a $2 component you will have to replace the entire board.
10) Reassemble and done.

Posted on Oct 07, 2012

Testimonial: "Absolutely correct solution of the problem!!!"

  • vlassovy
    vlassovy Oct 07, 2012

    I fixed it two months ago. When inspecting the circuit board I indeed found slightly "inflated" electrolytic capacitor. After replacing it the cooktop worked again like a charm. Total repair cost: $0.00 (I got the same capacitor as a gift). Thank you anyway.

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