If your dishwasher Bosch stopped heating water or drying dishes, and an error code appeared on the display, most likely the heating element has failed. This problem is one of the most common in household appliances of this brand and often leads to the dishwasher simply stopping in the middle of a cycle or giving a signal that it cannot continue washing.
Replacing the heating element yourself is a very real task for a person with basic skills in working with tools, which will save a significant amount on the services of a service center. In this article, we will look in detail at how to diagnose a malfunction, what tools will be needed, and how to properly dismantle and install a new heating element so that your equipment will serve you again for many years.
It is important to understand that ignoring the problem with water heating can lead to more serious consequences, including breakdown of the control module or the formation of persistent contaminants inside the tank due to poor dissolution of detergents. Flow heater or an open-type heating element is the heart of the washing system, and its serviceability is critical for the hygiene of the process.
Diagnosis of heating element malfunction
Before disassembling the equipment, you need to make sure that the problem lies in the heater, and not in the sensors or electronics. The first sign of a malfunction is cold water coming out of the machine after the cycle is completed, although the program provided for heating. Also dishwasher Bosch may produce specific error codes such as E:09, E:11 or E:14, which indicate problems with temperature conditions or leakage caused by depressurization.
A visual inspection of the heating element often reveals swelling, cracks in the body or obvious traces of scale, which impedes heat transfer. If the heating element is covered with a thick layer of lime deposits, it works with overload, which ultimately leads to the burnout of the nichrome spiral inside the metal tube. Sometimes the element visually seems intact, but a test with a multimeter shows an open circuit.
- 🔌 The machine knocks out the automatic switch in the shield immediately after turning on the washing mode.
- 💧 The appearance of water under the car if the heating element has through corrosion or a crack in the body.
- ❄️ The dishes remain wet and cold even after the drying program is completed.
- 📉 A sharp increase in cycle time as the machine tries unsuccessfully to heat the water to the set temperature.
⚠️ Attention: Before starting any diagnostics, be sure to disconnect the dishwasher from the power supply! Residual voltage in the circuit can lead to electric shock, even if the device is turned off with the button.
For accurate diagnostics, use a multimeter in resistance measurement mode. The normal resistance of a working heating element with a power of 2 kW is approximately 20–30 Ohms. If the device shows one (infinity) or zero, the element must be replaced. Also check the resistance between the contacts and the body - there should be infinite (break), any value indicates an insulation breakdown.
Choosing an original heating element or an analogue for Bosch
The aftermarket offers many options, but for dishwashers Bosch and Siemens (they are assembled at the same factories) it is critical to select a part with an exact match of geometric dimensions. Installing a heating element that is inappropriate in size may result in it simply not fitting into place or touching the plastic elements of the tank, melting them.
Original spare parts are marked with codes starting with the prefix 00 or 10, followed by a six-digit number. The most common heater models for modern Bosch dishwashers have a power of 2000 W or 2100 W. When purchasing an analogue, pay attention to the length of the heating tube, the bending angle and, most importantly, the method of attaching the temperature sensor.
| Parameter | Original Bosch | High-quality analogue | Cheap analogue |
|---|---|---|---|
| Housing material | Stainless steel | Stainless steel | Thin alloy |
| Service life | 5-7 years | 3-4 years | 1-2 years |
| Fit accuracy | Perfect | good | Needs improvement |
| Price | High | Average | Low |
Some craftsmen recommend installing heating elements coated with an anti-scale composition, however, for dishwashers this is not always justified, since the chemical composition of the detergent tablets may react with the coating. It is better to choose a trusted electrical manufacturer, such as Thermowatt or Irca, who are often suppliers to the conveyor belt itself Bosch.
Always write down the E-Nr (model number) of your dishwasher on the end of the door before going to the parts store. This guarantees 100% compatibility of the part.
Necessary tools and workplace preparation
To successfully carry out repairs, you do not need complex professional tools, but the set must be of high quality. Dishwashers Bosch are assembled using screws of various standards, including rare slots, so having a good screwdriver with a set of bits is a must.
The workplace must be well lit, since many components are located deep in the housing and require visual inspection when disconnecting cables. Cover the floor in front of the machine with thick cloth or cardboard to prevent damage to the flooring by falling parts or tools, and to collect any residual water.
- 🔧 Phillips and slotted screwdrivers of various sizes.
- 🔑 Set of Torx bits (star) sizes T20 and T25.
- 🔦 Flashlight for illuminating the interior space.
- 🧤 Fine-nose pliers and wire cutters.
- 🧽 Rags and container for draining water.
Before starting work, turn off the water supply tap and disconnect the hoses. Even after draining the main water, liquid may remain in the siphon and the bottom of the machine, so be prepared for water to leak when the machine is tilted. Prepare a container with a capacity of at least 1 liter to collect the residue.
☑️ Preparation for repairs
Dismantling the dishwasher and accessing the heating element
Most models Bosch The heating element is located in the lower part of the washing chamber, under the coarse filter. However, access to electrical contacts and fasteners often requires partial disassembly of the housing or complete removal of the machine from the niche. If the machine is built into a kitchen unit, it must be detached from the countertop and side walls of the cabinet.
Carefully lift the dishwasher out of the niche, using your feet to help avoid damaging the front panel on the edges of the furniture. Place the car on its side on a prepared soft surface, first securing the door with tape so that it does not swing open. In this position, access to the bottom is available, where the heating element connection nodes are often located.
Remove the bottom panel (bottom), if present. In some models, access to the heating element is achieved by removing the side wall. To do this, unscrew the screws around the perimeter of the case. Be careful with sharp metal edges. Find the heating element - it looks like a curved tube going into the tank, with two contacts to which wires go.
⚠️ Attention: When laying the machine on its side, make sure that the internal mechanisms (baskets, sprinklers) are securely fixed or removed, otherwise they may damage the plastic parts due to friction.
If your model belongs to a series with a flow-through heater (located on the side, near the pump), the algorithm may differ. In classic models with an open heating element at the bottom of the tank, after removing the bottom cover you will see a round flange with two terminals. It is this unit that we have to replace.
Heating element replacement process
First of all, take a photograph of the location of the wires suitable for the heating element so that during assembly you do not confuse the polarity or ground connection. Although AC current does not require polarity, the ground wire must be connected exactly where it belongs for safety. Carefully disconnect the terminals by pulling on the lugs themselves, not the wires.
Next, you need to unscrew the nut or screw holding the pressure plate of the heating element. In cars Bosch often a special wide-brimmed nut or an asterisk screw is used. When unscrewing, hold the heating element itself with your hand so that it does not fall inside the tank when the fastening is released. The rubber cuff may dry to the metal, so carefully loosen the element.
Remove the old heating element. If it is coated with limescale, be careful not to get any limescale particles into the drain pump. Clean the seat in the tank from dirt and remnants of old rubber. Install the new heating element, making sure that the rubber seal fits evenly into the groove around the entire perimeter. Seal misalignment is the main cause of leaks after repairs.
Installation procedure:1. Insert the heating element into the hole until it stops.
2. Make sure that the flange is parallel to the tank wall.
3. Tighten the fastening nut/screw until it fits snugly (without fanaticism).
4. Attach the power and ground terminals.
5. Check the reliability of fixation.
Nuances of tightening fasteners
Do not overtighten the heating element fixing screw! Excessive force may deform the flange or damage the rubber seal, causing leakage. Tighten until the rubber resists firmly.
After installing the electrical part, reassemble the housing in reverse order. Install the side wall or bottom, tighten all the screws. Return the machine to an upright position. Now you need to check the tightness of the connection before a full start.
Functionality check and first launch
Do not rush to immediately start a full washing cycle with dishes. First, connect the water supply and drain hoses, open the tap and carefully inspect the installation site of the heating element for leaks. If the floor or under the machine is dry, you can connect the power supply.
Run a short wash program without dishes. While operating, listen to the machine: there should be no extraneous hissing (a sign of a breakdown of electricity in the water) or gurgling sounds in the heater area (a sign of boiling water due to contact with air or scale). 5-10 minutes after the start of washing, carefully open the door (if the program allows) and check the temperature of the water inside.
- 🌡️ The water must be hot, corresponding to the selected program (usually 50-70°C).
- 🔇 No buzzing or crackling noise in the area of the bottom of the car.
- ✅ No error codes on the display after the cycle is completed.
- 💧 Dry floor under the car after draining the water.
If the machine successfully completed the test cycle, heated the water and did not display any errors, the repair can be considered successful. Tightness connections are a key factor in the long life of the new element. During the first few cycles, it is recommended to periodically check the area around the heating element through the inspection window or by opening the door slightly to ensure that there are no micro-leaks.
Successful replacement of the heating element is confirmed by stable water heating and the absence of errors during the first 3-5 washing cycles.
Frequently asked questions (FAQ)
Is it possible to run a dishwasher without a heating element?
Technically, you can start the machine by selecting the “Cold Wash” mode or turning off the heating in the settings (if the model allows it). However, washing dishes with cold water is extremely ineffective: fats do not dissolve and bacteria do not die. In addition, some programs may be blocked by electronics if there is no heating signal.
Why did the new heating element burn out after a week?
Most often this happens due to a malfunction of the thermostat or temperature sensor, which does not give the command to turn off the heating, and the water boils. The cause may also be low voltage in the network or a defective spare part itself. Always check the associated circuit components.
Is it necessary to lubricate the rubber cuff of the heating element?
You cannot use regular lubricant, as it can corrode the rubber. If the seal does not fit tightly into the groove, you can lightly moisten it with water. Some technicians use a thin layer of food-grade silicone, but in most cases, installing a dry, clean cuff is the right solution for Bosch.
How to clean the heating element from scale without replacing it?
Mechanical cleaning with a knife is prohibited - it will damage the shell. You can use special anti-scale agents for dishwashers by running a cycle at high temperature. However, if the heating element is already burnt out or has cracks, cleaning will not help and replacement is required.
What does error E:09 mean after replacing the heating element?
Error E:09 (or similar) may indicate that the new heating element is not connected, poor contact in the terminals, or the problem is not in the heater, but in the control module. Check the wire connections and the integrity of the fuse on the control board.