I've got a Bosch cooktop (part number PKF645E01A) and the inner-ring of the double-burner element has stopped working (the outer ring works fine). I've opened up the cooktop and notice that the double-burner element has 3 wires.
I've checked the resistance between the wires and have found the following:
The first and second wires have zero resistance:
The first and third wires have 33.3 ohms of resistance:
The second and third wires have zero resistance:
It seems that the element is faulty, but before I go ahead and order a replacement burner, I'd like to confirm that this is in fact the case, which brings me to the following questions:
- Based on the resistance values posted above, does it seem as though this burner is defective? If there's not enough information to know this, what else can I check?
- Is there a way I can connect this burner directly to a power source to test the burner elements so I can either confirm that the inner element is faulty, or demonstrate that it works?
- What's the purpose of the three wires?
Thanks for all the fantastic responses! I followed the advice from ecnerwal and ordered a replacement double-burner element from here for €50 (plus €75 for shipping!) and after swapping out the old burner with the new one, here are the new meter readings:
The first and second wires have 100Ω of resistance:
The first and third wires have 34.7Ω of resistance:
The second and third wires have 66Ω of resistance:
And I'm happy to report that the new burner functions as expected: