How to replace a hotplate on an electric stove?

Hotplates have long been a multifunctional appliance. For example, the timer is set for switching the electric spirals when the same food is cooked according to the same or similar recipes in the same dish. You just need to set the cooking mode and move away from the stove for other matters. The hob will itself reduce or add heat at the right time. And after the end of cooking, it will be disconnected from the mains.

A common problem is the burnout of the spirals, the failure of the switching relays and switches. To change the same electric burner, there is no need to invite a master from the nearest service - having at least minimal knowledge of electrics and circuitry for electric heaters of any purpose, you will change a non-working part to a new one with your own hands. The only requirement is compliance with electrical safety rules.

In the usual design, the electric burners (electric spirals) are installed on a steel panel covered with heat-resistant and high-strength enamel. The heating element itself is located inside, in a large round opening - it is installed on a stainless structure. The heating element is made in the form of a coil or "blank" of a closed type.

The simplest home-made slab is a pair of refractory clay bricks, standing side by side and fixed on a rectangular base with a steel corner profile that has legs at the corners. An open groove has been punched in the bricks, in which an ordinary nichrome electric spiral is located. These stoves do not need any additional electrics - the spiral is positioned and stretched so that the whole heat is sufficient for preparing most everyday dishes without deviating from the recipe used. It is as easy as shelling pears to replace a failed spiral, for this you do not have to disassemble anything - the whole structure is in plain sight.

Modern electric stoves are assembled according to the type of a classic gas 4-burner stove, and are also equipped with electronics - according to the type that is installed in a multicooker. Be that as it may, the classic burner is equipped with a 5-position switch, where the double spiral of each of the heating elements operates in four modes:

1. sequential inclusion of spirals;
2. a weaker spiral works;
3. a more powerful spiral works;
4. parallel inclusion of spirals.

Failure of the switch, burning of the output terminals of the heating coil (or "pancake"), where the electrical contact between the coils and switches disappears are the most common problems. In Soviet furnaces, ceramic-metal tumblers were used, withstanding 1 kilowatt and more power. They were then replaced by neon-lit switches and switch sets.

In halogen type electric burners, parts of the emitter are placed in different places of the heating element, which allows the burner to reach the operating temperature in a matter of seconds. This favorably distinguishes the "halogen" from the slowly, in a few minutes, heating, thermoelement operating on the basis of a nichrome spiral. But "halogens" are somewhat more difficult to repair.

Most often a list of instruments small for work:

• flat, hex and figured screwdrivers;
• pliers and pliers;
• multimeter;
• soldering iron.
• tweezers (when minor work is planned).

Expendable materials:

• solder and rosin for soldering work;
• insulating tape (preferably non-flammable).

In addition, of course, get a heating element that is as similar as possible to the one that has just burned out. The same applies to switches or switches. But if the electronic control device is inoperative, it is best to contact the service center, since you are unlikely to want to buy two hobs next time, the spare parts of one of which would be useful if the other fails.

Before proceeding with the repair, check the voltage in the outlet where the electric stove itself is connected by turning on the tester to measure the mains voltage or by connecting any electrical appliance to this outlet. Also remove the grounding (or grounding) wire - it is fastened with a separate nut.

If, nevertheless, the burner does not heat, then, in addition to switches and electric coils / halogens, the wires could be disconnected - their contacts are oxidized, and from constant overheating - the air inside the electric stove can reach 150 degrees - sooner or later the insulation from the wires will crumble. Checking the integrity of the terminals and wires, as well as the "ringing" of the electric spirals, each with a resistance of up to 100 ohms, is able to identify the place of contact failure. Clean the terminals, replace the wires with broken insulation, restore the connection if the wire is broken.

The reason for the breakdown of the heating element, which has the shape of a pancake, and not a coil, may be a structure that has burst over time, in the crack of which a spiral running inside is visible. Such a thermoelement, most likely, will also not work for a long time.

If it is not possible to "ring" some spirals of the heating element, it can only be changed, since it is closed. An open spiral on homemade stoves allows you to connect the place of burnout (breakage) - for some time you can use such a stove further, but this cannot be done with a full-fledged heating element.

In some cases, the fact that the heating coil will soon fail is indicated by a "critical point" on it - it gets hotter much more and gives a bright red-orange light. There is little sense from the point excess heating of the spiral - most often it occurs when the heating element is operating at full power. It is possible to extend the service life of the heating element without turning it on at full power - to exclude from the work that of the spirals on which the point overheating occurs, or to turn it on, but separately and for a short time.

In electric stoves equipped with an electronic control unit (ECU), both the main controller, which sets the operating mode, and the heating sensors on each of the burners can be damaged. Try to temporarily remove the ECU and connect any of the electric burners directly to the network - most likely, it will be designed for such use, however, you will have to forget about its electronic control until the ECU is restored / replaced. Repair of the ECU board consists in checking and replacing sensors, relays and thermostats.

The breakdown manifests itself not only by the absence of heating and heat generation, but also by extraneous odors. The smell of burning is formed when particles of food are burned, while cooking, which got on the heating element. Unplug the burner, wait until it cools down, and thoroughly wash food and burn stains from its surface. The smell of burning food will go away. Less often, the smell of burning plastic appears - it is not recommended to continue to operate the burner: the burnout of the insulation can lead to a short circuit with unpleasant consequences.

There are three reasons for this behavior of the burner:

1. during the repair, you assembled the circuit incorrectly;
2. the switch does not work (sticking of conductive contacts);
3. the computer failed (for example, sticking of the relay contacts that control the operation of individual burners).

A hob that has worked properly for 10 or more years sometimes fails due to aging of the materials from which the processor is made (the microcontroller or its entire board as a whole), on which its precise and accurate operation depends.

When replacing the burner, the bolts holding its round base are unscrewed, the damaged heating element is removed, and a new one is put in its place - the same.

When connecting wires and switches, follow the original electric circuit diagram. Otherwise, when the burner is turned on to position 3, a weaker, not more powerful spiral will heat up, and the burner may also work at full power, although this actually corresponds to a completely different mode. With a complete violation of the scheme, you can get both an incompletely working electric stove, and completely disable it, which will entail much higher repair costs.

You will learn more about replacing the burner on an electric stove in the following video.