VERIFIED
The warning that came earlier
Thinking back, you may remember that the coffee had been a little off. Thinner, less crema, cooler, slower. Then E40 arrived and the machine stopped. The code is model-dependent, so its definition remains open, but that earlier drift is a genuine clue to how the machine was declining. Roughly when the change began is worth remembering, because a gradual drift and a sudden change point to different causes.
What taste changes can suggest
- Thin, watery coffee often goes with weak pump pressure or a coarser grind
- Lukewarm cups point to the heating side
- Bitter, burnt flavor can be stale oils or too hot water
- Sour or sharp flavor suggests water that is not hot enough or a very short brew
These are tendencies and not diagnoses, but a technician listens to them. The grinder crushes the beans, so a coarser or uneven grind can thin out a cup without any water fault.
Rule out the beans first
Before blaming the machine, consider the beans. A bag that has been open for weeks, or beans stored in a warm cabinet, make flat coffee in any machine. Try a freshly opened bag and a clean hopper. If the flavor recovers, the machine is less implicated.
Cleanliness matters too
A brewing area coated with old oils changes taste and slows flow. The milk system, if used, can add a sour note. Following the cleaning and descaling routine often restores a lot of flavor.
Owner checks
- Taste a cup made with a fresh bag of beans and fresh water.
- Check the date of the last descaling and cleaning.
- Time how long a standard cup takes, and compare with what you remember.
- Restart once and brew a single drink.
What a technician measures
Water temperature at the spout, pump pressure, flow volume per cup and the grinder’s output are compared with the model’s specification. That turns a vague impression of weak coffee into numbers. Those numbers show whether the water side, the pump or the grinder moved away from normal first.
A short example
A home office user notices that the afternoon coffee has taken longer and tastes flat for about ten days. Then the machine stops with E40 in the middle of a cup. That timeline, taste first and code later, tells a technician to measure pressure and temperature and not to start with the board.
When to book
If E40 stays after fresh beans, fresh water and proper cleaning, the cause sits inside the machine. Describe the taste change and its timing when you call. A written estimate follows the diagnosis, and any part is fitted only if you agree.
Frequently asked questions
Often yes. Weaker, cooler or slower cups can show a part declining before the control stops the machine.
Try a freshly opened bag and fresh water. If the taste recovers, the machine is probably less at fault.
Old oils and scale affect taste and flow, so a proper routine can restore much of it.
The date you first noticed the change, how the coffee tasted and whether cups became slower.
Model compatibility: Bertazzoni reuses codes across series and model years, so E40 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
