Operation Manual

THE INDUCTION HOB
Technical training
- 38 -
CU3-INDUCTION-003UK-10/05
DIAGNOSTIC
14 - AID TO DIAGNOSTIC
Prior The first step is to identify the symptom of the problem with the hob. To help you in your
diagnostic, the hob displays a few dysfunction messages, remember that on each power-up, you have
to wait a few seconds for it to start operating.
Ensure that the problem is not related to the use of a specific container, check in the
"Class Induction" list that the container is part of it or check the "lock-on" by using a test container.
14.1. - The glass-ceramic breakages
Mechanical and thermal overloads cause very characteristic breakage profiles, which are different on
principle, so that the cause is easy to detect.
The four main causes are
:
• Overheating (on radiant / halogen source only)
• A shock on the hob
• A tight assembly
• A plate subjected to too significant a pressure (contraction)
In case of confusion, it is advisable to assemble the plate pieces with adhesive tape before
disassembling the plate for assessment purposes.
14.1.1. - Breakage resulting from overheating
This type of breakage must not exist on an induction hob.
Overheating causes breakage profiles, as shown by the two drawings
of hob, each with a cooking area. Cracks of circular shape, that
appear within the cooking area or at the edges, are very typical.
Breaks, such as shown by drawing A, appear more often at the
beginning of cooking or during cooking. Breaks, such as shown by
drawing after hob cooling down. Often, the user will say that the hob
cracked during or after cooking without his/her intervening.
Causes
: The regulation of the heating element is defective.
14.1.2. - Breakage resulting from a shock or knock
The break profile looks like a spider web. From the point of impact, radial
cracks R start and divide the cooking surface area. Broken pieces are
subdivided into several parts by circular cracks T around the place that
received the knock. The number of pieces much depends on the shock
strength.
A
B