i keep getting error code 'e02' on the screen and the machine shuts down after a minute.

Diagnosis

The E02 error on the De'Longhi Magnifica Evo ECAM29043SB is a "Boiler Refill Timeout" fault. This occurs when the machine's internal flow meter does not detect a sufficient volume of water moving from the reservoir into the thermoblock boiler within a predefined time window (usually 30 to 60 seconds). Because the machine cannot confirm the boiler is full, it triggers a safety shutdown to prevent the heating element from burning out—a condition known as "dry firing." This failure is rarely electronic; it is almost always a mechanical or chemical obstruction in the water path. The most common culprits are airlocks in the pump, calcium carbonate buildup (scale) blocking the narrow intake valves, or a misaligned water tank gasket. If the machine has recently been moved or has sat idle for several weeks, air bubbles can become trapped in the pump head, preventing the vacuum necessary to pull water from the tank. You can confirm this by listening to the pump: if it sounds louder or "hollower" than usual during the startup phase, it is likely cavitating due to an airlock or blockage.

How to Fix It

To resolve the E02 error, you must clear the water path and reset the hydraulic pressure. Follow these steps in exact order:

1. Tank Reseating: Remove the water tank completely. Inspect the rubber O-ring at the bottom of the tank and the intake valve on the machine's base. Ensure there is no coffee ground debris or lime scale preventing a watertight seal. Firmly press the tank down to ensure it is fully seated.
2. Priming the Circuit: If the machine is airlocked, you need to force water through. Turn the machine on and, if possible, activate the hot water function (if your specific sub-model has a dedicated spout) or the steam wand. Open the steam dial fully. This allows the pump to push air and water out of the system without the resistance of the brew group, which often clears the E02 trigger.
3. Manual Air Purge: If the pump is humming but no water moves, remove the water tank and quickly "pump" it up and down 3-4 times in its slot. This can sometimes force a burst of water into the intake valve, breaking the air bubble.
4. Deep Descaling: If water is flowing but the error persists, scale is likely restricting the flow rate. Fill the tank with 100ml of De'Longhi EcoDecalk solution and top up with water. Navigate to Menu > Settings > Maintenance > Descaling. Follow the prompts to run the full cycle. Ensure you run the rinse cycle twice to clear all acidity from the boiler.
5. Hard Reset: Power the machine off using the main switch at the back, unplug it from the wall for 60 seconds, and restart. This clears the temporary error cache in the PCB.

If That Didn't Work

• Inspect the Water Tank Filter: If you are using a disposable water filter inside the tank, remove it entirely. A clogged filter can restrict flow just enough to trigger the E02 timeout. Try running the machine without the filter to see if the error disappears.
• Clean the Infuser (Brew Unit): Remove the brew unit (the central mechanism) from the machine. Rinse it under warm water to remove compacted coffee oils. A heavily clogged infuser can create back-pressure that the machine interprets as a flow failure, triggering the timeout.
• Check for Kinked Internal Tubing: If you have recently opened the machine or if it has suffered a hard impact, an internal silicone hose may be pinched. This requires opening the chassis to ensure the tube leading from the pump to the thermoblock is not collapsed.
• Pump Replacement: If the pump makes no sound or a very faint clicking sound, the pump motor (Part No: 5513214101 or equivalent) may have failed. If the pump cannot generate the required 15 bars of pressure, the flow meter will never trigger the "refilled" signal.

Heads Up

• Water Quality: Using distilled water can actually cause some De'Longhi sensors to malfunction or lead to "aggressive" water that leaches minerals from the boiler. Use filtered tap water for the best balance of longevity and performance.
• Descaling Frequency: Do not wait for the "Descale" light to blink if you live in a hard-water area. Perform a descale every 200-300 cups to prevent the microscopic scale buildup that leads to E02 errors.
• Tank Maintenance: Always wipe the bottom of the water tank and the receiving valve with a damp cloth weekly to prevent "slime" or mineral crusts from forming at the seal point.
• Avoid Dry Running: Never attempt to run the steam or brew functions if the water tank is empty; this is the fastest way to introduce airlocks and cause a permanent E02 failure.