The drain pump is one of the key components of a dishwasher Bosch, responsible for pumping out dirty water after the washing cycle is completed. Its breakdown leads to the fact that the equipment stops draining water, displays errors on the display, or refuses to start at all. In 80% of cases, the problem is solved by replacing the pump, but many owners are afraid to undertake repairs themselves for fear of damaging the electronics or breaking the tightness of the system.
In practice, replacing the drain pump in dishwashers Bosch (episodes SMS, SPV, SKS etc.) is a task of medium complexity that even a beginner can handle with minimal tools. In this article we will look at Accurate signs of pump failure, we will describe in detail the process of dismantling it and installing a new one, and also give recommendations on the selection of original and analog spare parts. We will place special emphasis on typical mistakes that are made during repairs and ways to avoid them.
Signs of a malfunctioning drain pump in a Bosch dishwasher
The first signal about problems with the drain pump is error E24 or E25 on the display (depending on model). These codes indicate a problem with the drain system. However, similar errors can appear when the filter is clogged or the drain hose is kinked. To accurately diagnose a pump failure, pay attention to the following symptoms:
- 🚨 Car does not drain water After the program ends, dirty liquid remains in the pan.
- 🔊 Pump buzzes or creaks, but the water does not drain (a sign of wear on the impeller or bearings).
- 💧 The water is drained very slow, although the filter and hoses are clean.
- 🔌 Dishwasher knocks out the machine gun when trying to drain (short circuit in the pump winding).
- 🔄 Washing program freezes at the draining stage and does not go further.
If at least 2-3 of these signs coincide, the probability of pump failure is 90%. Before replacing, be sure to check:
- Cleanliness drain filter (located at the bottom of the chamber).
- Patency drain hose (blow it out or rinse it under pressure).
- Performance pressure switch (water level sensor) - if it malfunctions, the machine may “think” that the water has already been drained.
Important! In models Bosch with the system AquaStop (for example, SMS69T08EU or SPV69T50EU) the pump may be blocked due to the activation of the leakage protection. Before replacing, reset the error by unplugging the machine for 10 minutes.
How to check the drain pump of a Bosch dishwasher without disassembling
Before disassembling the machine, you can perform a preliminary diagnosis of the pump using a multimeter. To do this:
- Unplug the dishwasher and turn off the water supply.
- Remove the bottom panel (pan) of the machine by unscrewing 2-4 screws.
- Find the pump - it is located at the bottom of the housing, next to the filter, and connected to the drain hose.
- Disconnect the power terminals from the pump and check its resistance:
- 🔧 Normal winding resistance: 150–300 Ohm.
- 🔧 Resistance between contacts and body: infinity (during breakdown it will be less than 1 MOhm).
If the winding resistance is 0 ohm (short circuit) or infinity (break), the pump must be replaced. Also inspect the impeller through the technological hole - it should not be chipped or turn freely by hand (this indicates wear of the bearings).
How to test a pump when it is energized (for advanced users)
Apply 220V voltage to the pump contacts through an RCD. The working pump should hum evenly and pump water. Never test the pump without protection - risk of electric shock!
Step-by-step instructions for replacing the drain pump in a Bosch dishwasher
To replace the pump you will need:
- 🔧 Phillips and flat screwdrivers.
- 🔧 Pliers or round nose pliers.
- 🔧 New pump (original or analogue, see table below).
- 🔧 Silicone grease (for rubber seal).
- 🔧 Rags and a container for collecting water.
Average replacement time: 40–90 minutes (depends on model and experience). Follow the instructions:
☑️ Preparing to replace the pump
Step 1: Removing the bottom panel and draining the water
Turn the car on its side or tilt it backwards to gain access to the underbody. In some models (for example, Bosch SMS50E32EU) just remove the front bottom panel by unscrewing 2 screws. Before continuing, drain any remaining water through the emergency hose (usually located next to the filter) or by tilting the machine.
Step 2: Disconnecting the Pump
Carefully disconnect:
- 🔌 Power terminals (remember or take a photo of their location!).
- 💦 Drain hose (can be attached with a clamp - loosen it with pliers).
- 🔗 Plastic pipe connecting the pump to the pump (remove the clamp and pull up).
In some models, the pump is attached to the body with 2-3 self-tapping screws - unscrew them. Be careful: water may remain in the pipes!
Step 3: Installing a New Pump
Before installing a new pump:
- 🧼 Clean the seat from dirt and sealant residues.
- 🔄 Check the integrity of the rubber seal (if necessary, lubricate it with silicone).
- 🔧 Make sure that the impeller of the new pump rotates freely (without jamming).
Connect the pump in reverse order: first the pipes and hoses, then the power terminals. Secure it with self-tapping screws (do not overtighten!).
Step 4: Check functionality
Connect the machine to water and network, run a test program (for example, Rinse). Make sure that:
- 💧 The water drains quickly and without any residue.
- 🔊 The pump does not make any extraneous sounds.
- 🚫 There are no leaks at the connections.
If the pump does not work after replacement, check the fuse on the control board (it often blows when there is a short circuit in the pump).
Original and similar pumps for Bosch: compatibility table
When choosing a new pump, be guided by article number of the original spare part, which is indicated on the body of the old pump. For dishwashers Bosch The most common pumps are the following series:
| Original article number | Dishwasher models | Analogs (brand + article) | Average price, ₽ |
|---|---|---|---|
00643617 |
SMS50E, SMS69T, SPV53M | Samsung DD82-00463A, Electrolux 131643600 |
2 800–3 500 |
00643618 |
SMS40E, SKS62E | Indesit C00288760, Whirlpool 481248335585 |
2 500–3 200 |
00643619 |
SMS66GI, SPV69T50 | LG 6601ER1004A, BEKO 2405000100 |
3 000–4 000 |
00643620 |
SMS88TI, SKT6002 | Ardo FLP 1000, Zanussi 131643601 |
3 500–4 500 |
When purchasing an analogue, pay attention to:
- 🔗 Mounting type (number and location of holes for self-tapping screws).
- 🔌 Terminal locations (must match the original).
- 💦 Nozzle diameter (standard for Bosch is 22 mm).
Original Bosch pumps last 1.5–2 times longer than their analogues, but their price is 20–30% higher. If your budget is limited, choose analogues from Samsung or Electrolux - they are the most reliable.
Common mistakes when replacing a drain pump and how to avoid them
Even experienced craftsmen sometimes make mistakes that lead to repeated breakdowns or leaks. Here are the most common of them:
⚠️ Attention! Never use sealant in place of sealing gum. Silicone caulk cracks over time, leading to leaks and short circuits.
- 🔧 Pulling screws — leads to deformation of the pump housing and leaks. Tighten them with a force of no more than 1–1.5 Nm.
- 🔌 Incorrect terminal connections — if the polarity is reversed, the pump will work in the opposite direction (the water will not drain). Always check the photo!
- 💧 Ignoring pipe inspection - Cracks or blockages in the hoses can simulate a pump malfunction.
- 🧲 Ingress of metal particles — when assembling, make sure that no screws or pieces of plastic fall into the chamber.
Another common problem is incomplete drainage of water after replacing the pump. Reasons:
- Clogged air valve (located next to the pump).
- Defective pressure switch (check its resistance with a multimeter).
- Pinched drain hose (make sure it is not bent).
Preventing drain pump breakdowns
Average pump life in dishwashers Bosch - 5–7 years. To make it work longer:
- 🧼 Clean the filter after every 5–7 washing cycle (even if the machine does not display errors).
- 🚫 Do not wash in the dishwasher objects with food remains (bones, peels, grains).
- 💧 Use a water softener — hard water accelerates wear of the impeller.
- 🔧 Check the drain hose for bends once every 3 months.
- 🔄 Run the cleaning program (for example,
Intensive 70°C) once a month.
If your dishwasher is often used to wash heavily soiled dishes (for example, after frying), install additional coarse filter at the inlet of the drain hose. This will reduce the load on the pump and extend its service life by 20–30%.
When purchasing a new Bosch dishwasher, give preference to models with metal pump impeller (for example, series SMS8). They are less susceptible to wear and tear than plastic ones.
Cost of repairs: do it yourself or call a professional?
The cost of replacing the drain pump at a service center depends on the model and region:
| Type of repair | Cost, ₽ | Due date |
|---|---|---|
| Pump replacement (with spare part) | 4 500–7 000 | 1–2 days |
| Pump replacement (without spare parts) | 2 500–4 000 | 1 day |
| Diagnostics + replacement | 5 000–8 500 | 2–3 days |
| Visit of a specialist to your home | 1 500–3 000 | — |
Replacing it yourself will cost 2 500–4 000 ₽ (pump price + tools). It is profitable to repair it yourself if:
- 🔧 You have experience working with technology.
- 🕒 You are not limited in time (the master will arrive in 1-3 days).
- 🛠️ You are confident in the diagnosis (you have not confused the pump with the pressure switch or control module).
⚠️ Attention! If the dishwasher is under warranty, repairing it yourself will result in its loss. In this case, be sure to contact an authorized service center.
FAQ: Frequently asked questions about the Bosch dishwasher drain pump
Is it possible to repair the drain pump, or just replace it?
In 90% of cases, the pump only needs to be replaced, since its body is non-separable, and the impeller and bearings wear unevenly. The exception is clogged impeller (can be washed under high pressure water) or oxidation of contacts (cleaned with alcohol).
Which pump is better: original or analogue?
Original pumps Bosch (00643617, 00643618 etc.) last longer, but cost 20–30% more. Analogues from Samsung or Electrolux cheaper, but their service life is 1–2 years less. For models older than 5 years, it makes sense to take an analogue one.
Bosch dishwasher shows error E24 after replacing the pump. What to do?
Error E24 means that the drain system is not working. Check:
- Polarity of connecting terminals to the pump.
- Patency of the drain hose (possibly pinched).
- Operability of the pressure switch (water level sensor).
How long does it take to replace a pump?
On average - 40–90 minutes. The most labor-intensive stage is dismantling the bottom panel and draining the remaining water. In models with the system AquaStop (for example, SMS69T08EU) a protection reset may be required, which adds 10–15 minutes.
Can I use a dishwasher without a drain pump?
No. Without a pump, the machine will not be able to drain water, which will lead to overflow and operation. AquaStop and potential flooding. If the pump is broken, the equipment cannot be operated until it is replaced.