Loss of water pressure in the Delonghi Dedica is one of the most frustrating problems this espresso machine model suffers from. Fortunately, I have already fixed some Dedica machines and will explain it in this article.
Note: Please do not confuse problems related to deficient coffee grinding that result in pressure problems. In this guide, we refer to the internal problems of the coffee maker.
Scenario 1. Delonghi Dedica with LOW water pressure
The problem: When this occurs, there are two simultaneous situations; on the one hand, the coffee seems to come out without pressure, and on the other hand, we see more air bubbles entering the base of the water tank.
The cause: It is a failure in the “overpressure valve” of the coffee maker. This valve has small springs and plastic parts that deteriorate easily after many uses of the coffee maker.
The key to determining the failure of this valve is to observe the amount of water returning to the tank. Water should return to the reservoir when the pressure exceeds 15 bar; however, if the valve is defective, this happens at lower pressures, affecting the brewing.
The solution:
- Turn the coffee maker off and unplug it.
- The first thing to do is to disassemble the coffee maker.
- Then locate the overpressure valve (see photo above).
- Disassemble the overpressure valve.
- Check that there are no damaged parts inside the valve.
- If damaged, purchase a new overpressure valve (links below).
- Install the new valve
- Reassemble the coffee maker.
Delonghi Dedica overpressure valve spare parts
If the problem of lack of pressure in your Delonghi Dedica is related to the overpressure valve, it is recommended that you buy a new part and replace the old one. Here are some online stores where you can buy it:
Delonghi Dedica overpressure valve spare part in the US:
- Amazon.com: Delonghi 7313286129 Valve = $11.46
- Ebay.com: Delonghi Safety Valve = $16.95
- Ereplacementparts.com: Anti-drip valve= $5.51
Delonghi Dedica overpressure valve spare part in the UK:
- eSpares.co.uk: Delonghi Dedica coffee maker valve = £5.15
- Yourspares.co.uk: DeLonghi coffee machine safety valve for vibratory pump = £7.84
- Amazon.co.uk: Delonghi 7313286129 Valve £7.70
These are just some examples of where you can find this part. Search on Google using the terms “Delonghi Dedica overpressure valve” and find more online stores.
Scenario 2. Delonghi Dedica with NO water pressure at all
In this case, I refer to when the Delonghi Dedica coffee maker does not pour water, which happens suddenly. This situation occurs simultaneously as the water pump stops running; the coffee maker turns on, but there is only a buzzing sound.
The problem: When we hear a buzzing sound inside the coffee maker, it signals that the pump is receiving electricity. This is caused by the process of electromagnetism in the pump.
However, not hearing the pump’s vibration means that the pump is not moving its internal piston, so it is not pumping water.
The cause: Impurities in the water and its sediments often clog the pump’s internal components and may have clogged them. To avoid these problems, always perform periodic descaling.
Solution (1):
- Turn the coffee maker off and unplug it.
- Proceed to disassemble the coffee maker.
- Next, locate the water pump and check visually if it is defective.
- Tap the water pump with the rubber handle of a screwdriver.
- Turn on the coffee maker and check if the pump now works.
- If this does not work, very carefully turn on the coffee maker and simulate brewing coffee while tapping it again with the rubber handle of the screwdriver.
⚠️ Be very careful when handling the brewer without the housing live.
Solution (2): This option may be ideal if you like puzzles or assembling legos. If you don’t get a good result with this solution, go-to solution 3.
- Turn the coffee maker off and unplug it.
- Disassemble the coffee maker.
- Locate the pump.
- Remove the pump from the Dedica.
- Carefully disassemble all the components of the pump (see picture below).
- Clean each of the components.
- Reassemble all the pump components.
- Re-install the pump on the Delonghi Dedica.
The solution (3): There are occasions like the one you see in the image below where the lack of pressure appears together with a water leak in the Dedica.
- Turn the coffee maker off and unplug it.
- Proceed to disassemble the coffee maker.
- Locate the water pump and check that it is defective.
- Buy a new pump (links below) and replace the old one (try solution-1 first).
- Reassemble the coffee maker
Delonghi Dedica water pump spare parts
If, after disassembling the coffee maker, we understand that the water pump is damaged, we must buy a new water pump to replace the damaged one:
Delonghi Dedica water pump spare part in the US:
- Amazon.com: Delonghi Dedica Ulka pump = $34.98
- PartsTown.com: Delonghi 5113211281 PUMP= $25.95
- Fruugo.us: Delonghi ECOV310AZ = $19.95
Delonghi Dedica water pump spare part in the UK:
- eSpares.co.uk: Delonghi Dedica coffee maker water pump = £28.25
- Buyspares.co.uk: ULKA Model E Type EP5 48W = £22.70
- Amazon.co.uk: Ulka EP5 Vibration Pump = £13.96
Here are some links to buy a water pump for your Delonghi Dedica. If you are outside the US or UK, type in Google “Delonghi Dedica water pump” and find many online options.
Delonghi Dedica control board damaged
The Delonghi Dedica may have a damaged control board, often caused by a faulty capacitor leading to voltage drops in the pump and subsequent pressure losses in the coffee machine. To rectify this issue, purchase a replacement control board and install it.
The high cost of a new control board makes buying a used Delonghi Dedica and exchanging the control boards more cost-effective. In this example from eBay, you can see that it costs £44.84:
eBay.co.uk: DeLonghi Card Power PCB Machine Coffee Series DEDICA Ec680 Ec685 = £44.84
Final words
In most cases, the Delonghi Dedica loses pressure because of the water pump or the overpressure valve. However, each case is different, and your Dedica coffee maker may lose pressure for another reason.
If you have questions or your Dedica loses pressure for another reason, comment below, and other community members and I will help you solve it.
You may be interested in these other related articles:
I am astonished and heartened that there are still good people in the world who are still willing, for no gain, to offer help and advice to any casual enquirers.
Thank you!
Hi Irena, thank you very much for your kind words. I try to help a little bit with my knowledge and experience. Your comment makes writing these articles worthwhile.
Hiya,
My dedica lost pressure a while ago after we were living in a very hard water area. We descaled whenever prompted, but there is very poor pressure without any coffee, and with coffee in the noise from the pump(?) gets very quiet and dribbles out in drips.
I have replaced first the valve, and now the pump, but still the exact same issue persists, and I have no idea what to try next!
Any help is much appreciated!
Hi Ryan, I am very sorry that neither of the two proposed solutions worked in your case. The only other possibility I can think of is that there is a defect in the control board; a bad capacitor can cause the current to the pump to be lower than it should be.
I will add this possibility to the article in case others find themselves in your situation.