Bosch Coffee Machine Error 3: Water Pump Is Not Moving Enough Water

What Error 3 means

The machine begins a drink, makes pump noise, then stops with Error 3 and little or no water coming out. The control counts the water passing through and found too little. Either the water is not reaching the pump, such as from an unseated tank or a pinched supply line, or the pump itself is clogged or worn and cannot deliver the pressure the brew needs.

Common causes of Error 3

Water tank not seated, or a kinked supply hose on plumbed-in models
Pump partly blocked by mineral particles
Worn or burned-out pump

✓ One safe check you can try

1. Pull out the water tank, rinse it, fill it with fresh water and push it back until it seats fully. 2. On a plumbed-in model, trace the hose to be sure nothing is pinched and the valve is open. 3. Run a rinse cycle. 4. If Error 3 returns, call us. Do not open the machine.

! Why to stop there

Pumps run on household voltage inside a wet machine, so working inside it yourself carries real shock risk.
A blocked pump and a dead pump look the same from outside, and the cheaper fix may be only a cleaning.
Keeping on running it dry can overheat and ruin a pump that could have been saved.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Error 3Error 3 questions

What should I check first for Error 3?

Check the basics: the tank seated all the way, enough water in it, and no kink in a plumbed-in line. Many cases are an unseated tank. If those are fine, a pump inspection is the next step.

Is Error 3 a sign I need to descale?

It can be, since mineral flakes sometimes choke the pump. A descaling program per the manual is reasonable if it is overdue. If the error stays afterward, the pump likely needs attention.

Can I keep brewing if only some drinks fail?

We suggest stopping. A pump that struggles can fail completely and may overheat. A prompt check is cheaper than replacing more parts later, and we give a written price before starting.