When the dishwasher Bosch ceases to cope with basic functions, and alarm indicators light up on the display, the first thing the owner thinks about is calling a technician. However, often the cause of poor washing or lack of drying is a simple failure of the heating element. heating element (tubular electric heater) is the heart of the water heating system, and replacing it is a procedure that is accessible even to a non-professional with a minimum set of tools.
In this article we will look in detail at how to diagnose a malfunction, select the right spare part and carry out the replacement yourself, avoiding common mistakes. Understanding your equipment Bosch will help you save a significant amount on service costs.
Should I immediately run to the store for a new part? Not always. Sometimes the problem lies in scale or oxidized contacts, but if the spiral is burnt out, repairs cannot be avoided. Let's determine if the heater is really at fault.
Signs of a malfunctioning heating element
The first and most obvious symptom is the appearance of an error code on the display. For most models Bosch characteristic codes E:09 or E:24 (depending on the series), which directly indicate problems with water heating. The machine can draw water and start the pump, but the washing process will take place in cold water, which critically reduces the quality of fat removal.
The second sign is the dishes are not drying at the end of the cycle. If you take out the plates wet and cold, although they were previously dry and warm, this is a sure sign that heating element does not work at the final drying stage. It is also worth paying attention to the program execution time: cycles can drag on indefinitely, since the electronics will wait to reach the set temperature, which is physically impossible.
Sometimes a breakdown is accompanied by knocking out the circuit breaker in the electrical panel immediately after turning on the washing mode. This indicates an insulation breakdown or a short circuit inside the spiral.
- 🔥 The display shows an error code related to heating (E09, E24).
- 🌡️ The dishes remain cold and wet after the end of the program.
- ⏱️ The washing cycle lasts much longer than usual or freezes.
- ⚡ Knocks out traffic jams or RCD at the moment the heating is turned on.
It is important to understand that diagnostics must be carried out comprehensively. Before you sin on the heating element, make sure that the thermostat and temperature sensor are working properly, as they work in conjunction.
Diagnostics and testing of heating elements with a multimeter
Before ordering spare parts, you must be sure of the malfunction. For this you will need multimeter. The test procedure requires partial disassembly of the machine to gain access to the heater contacts. In models Bosch The heating element is often located at the bottom of the chamber, under the filter, or integrated into a flow-through heater.
First, set the device to resistance (Ohms) measurement mode. Disconnect the wires from the contacts of the heating element and touch the probes to the terminals. A working 2 kW element should show a resistance in the range of 20–40 ohms. If one (infinity) is displayed on the multimeter screen, it means that the spiral is broken and the part must be replaced.
⚠️ Attention! Before starting any diagnostic work, be sure to unplug the dishwasher from the electrical outlet. Testing under voltage is deadly and can destroy electronics.
It is also necessary to check the breakdown on the housing. Switch the multimeter to dialing mode. Press one probe to the contact of the heating element, and the other to the metal body of the heater or tank. If a squeak is heard, it means that the insulation is broken, and such equipment cannot be used.
Sometimes swelling, cracks or deep damage to the enamel are visually visible on the tube. In such cases, testing may not be carried out - the part clearly requires replacement.
Selection of original spare parts and analogues
Market of spare parts for household appliances Bosch is huge, and choosing the right part can be difficult. Original heating elements are marked with codes starting with 00243209, 00647222 or similar combinations. It is critically important to select the part strictly according to E-Nr (full model number), which is indicated on the end of the machine door.
Analogues from well-known brands such as Indesit Company (producing components for many brands) or specialized factories, are often not inferior to the original in quality, but are cheaper. However, cheap Chinese copies can quickly become covered with scale or have incorrect mounting geometry.
| Part type | Original code (example) | Average price (RUB) | Resource |
|---|---|---|---|
| Flow-through heating element | 00647222 | 2500 - 3500 | High |
| Bottom heating element | 00243209 | 1800 - 2800 | Medium |
| Analog (China) | Various | 800 - 1200 | Low |
| Heating element + Thermostat | Kit | 4000 - 6000 | High |
When purchasing, pay attention to the power of the element. Installing a heating element with a smaller number of kilowatts will result in the machine not being able to heat the water to the desired temperature, and a more powerful one may overload the wiring.
Preparation for replacement and necessary tools
Replacing the heating element in a dishwasher Bosch requires accuracy and a certain set of tools. You don't need fancy equipment, but without a basic set it will be difficult. Prepare your work area in advance by ensuring good access to the machine from all sides.
Gather the following tools: Phillips and slotted screwdrivers, pliers, a ratchet wrench with an 8 or 10 mm head (depending on the clamp model), and a container to drain any remaining water. Don't forget a flashlight, as there is usually no lighting in the lower part of the car.
☑️ Tools for replacing heating elements
It is also recommended to have silicone grease on hand for the seals and a rag to remove moisture. If you are changing a heating element that is attached to clamps, new clamps may be needed, since old ones are often deformed during dismantling.
⚠️ Attention! Never start disassembling if there is water inside the machine. Drain it through the drain filter or by carefully tilting the machine so as not to flood the electronic modules.
Step-by-step instructions for dismantling and installation
The replacement process depends on the design of your model Bosch. In most modern machines, the heating element is located below, under the basket. First remove the lower basket and coarse filter. You will see a plastic casing or the metal flange of the heater itself.
Unscrew the mounting bolts or remove the clamps holding the heating element. Be careful not to damage the plastic parts of the tank. Disconnect the wires, having previously photographed the connection diagram, since it is very easy to confuse the polarity or place the terminals on the wrong contacts. Pull out the old heating element by shaking it from side to side.
Installing the new part is done in the reverse order. Make sure that the rubber seal sits smoothly and does not have any kinks. When tightening the bolts, maintain uniform force so as not to distort the flange.
- 📸 Take a photo of connecting the wires before disconnecting.
- 🧼 Clean the installation site from scale and dirt before installing a new heating element.
- 🔧 Check the tightness of the seal after installation.
- 🔌 Make sure the wires do not touch the heating tube.
After assembly, do not rush to close all the panels. Turn on the machine in test mode and check if there are any leaks at the installation site and if the water is heating up.
What to do if the new heating element does not heat?
If the problem remains after replacement, check the integrity of the wiring from the control module to the heater. Often the wires fray at the bends or the contacts in the connector become oxidized. It is also possible that the control module itself is faulty and does not supply voltage to a working part.
Typical mistakes when doing DIY repairs
Self-repair of equipment Bosch is fraught with a number of errors that can lead to repeated failure. One of the most common is ignoring the status of the thermostat. If you are changing heating elements, be sure to check and, if necessary, replace the thermostat, as they often fail in pairs.
Another common mistake is poor terminal clamping. Poor contact leads to sparking, heating and eventual melting of the plastic, which can cause a fire. Use a quality crimping tool or securely tighten screw connections.
Also, technicians often forget to check the water pressure in the system. If the heating element burned out due to dry operation, it means that the water supply valve was faulty or the inlet filter was clogged. Installing a new heater without eliminating the cause of its combustion will only delay the problem.
Lubricate the rubber seal of the new heating element with a small amount of silicone grease or even dishwashing detergent. This will help install the part evenly without damaging the rubber and provide a better seal.
Prevention and service life extension
In order for a new part to serve for a long time, it is necessary to follow the operating rules. The main reason for the failure of heating elements is scale. Use quality water softeners and regularly add special salt to the machine's reservoir, even if you use all-in-one tablets.
Once every 3-4 months, it is recommended to carry out a preventive wash of the machine using citric acid or special cleaners for dishwashers. This will help remove deposits on the heating element before they become critical.
Regular use of dishwasher salt reduces the risk of scale formation by 80%, which directly affects the service life of the heating element and washing efficiency.
Do not overload the machine and keep the filters clean. A clogged filter leads to disruption of water circulation, which is why the heating element can overheat in local areas, even while in water.
Frequently asked questions (FAQ)
Is it possible to wash dishes if the heating element is burnt out?
Technically, the machine will work, but the quality of the wash will be extremely low. Cold water does not dissolve grease and does not activate most detergents. In addition, the absence of a drying step will lead to the appearance of an unpleasant odor and the growth of bacteria inside the chamber.
Why does the heating element burn out immediately after replacement?
Most often this occurs due to an air bubble around the heater when first turned on (dry operation) or a voltage surge in the network. The cause may also be a malfunction of the electronic module, which supplies voltage constantly, without temperature control.
How often do you need to change the heating element in a Bosch dishwasher?
Under normal operating conditions and using a water softener, the heating element lasts 5-7 years. If the water is very hard and salt is not used, the service life may be reduced to 2-3 years.
Is it possible to restore an old heating element?
If the spiral is intact and the problem is only scale, you can try cleaning the element with a weak acid solution. However, if an insulation breakdown or a spiral break occurs, restoration is impossible and dangerous - only replacement.