Maintenance of Italian coffee machine: common faults and handling methods of Delong coffee machine

Delong automatic coffee machine fault summary table

1 Delong coffee 3000/4000 series coffee machine after starting, warning light is always on, the machine does not work.

After entering the test mode, start the motor, the motor has a slight movement, but does not work. After inspection, the bridge stack (rectifier bridge) on the circuit board is damaged, replace the bridge stack, and troubleshoot.

2 Delong coffee machine 3000, 4000 series, fault: coffee water volume can not be adjusted, water shortage lamp flashing, but can make coffee, hot water, water shortage lamp does not light, but after making a cup of coffee, water shortage lamp flashing again.

Water meter broken

3 steam, no steam, later, water shortage indicator flashing.

There may be a problem with the pump.

4 If the automatic grinder has finished grinding, the pump starts to work to make coffee, and suddenly the water tank is pumped away, what will happen, what accessories will break, and how should it be handled.

The tank should be replaced and hot water should be run

The thermal protector of the heater is easily damaged

5 Delong coffee machine 3500, 6600, after starting, there is no Ready message for a long time, and finally GENERICARM appears.

Check for heat in the warm cup area

Generally, the heater does not work, check the temperature protector

6 Because the customer did not completely shut down, the extractor was forcibly pulled out and forcibly installed, but the water tray was not installed in place. How to solve the fault without disassembling the machine?

unplug the power

Manually reset coffee grounds and door switches

power is turned on

automatic extractor reset

7. The pillar used to fix the extractor in the shell part has been broken. How to solve it?

The original plastic pillars should be removed and replaced with company-supplied copper pillars

8 Delong coffee machine EAM3000,4000 series coffee machine, press the key, sometimes can not start, sometimes can not turn off, coffee powder lamp (the lamp in the bottom right corner) will light up for no reason, sometimes hand contact coffee powder button, do not press the key, the lamp will also light up.

Replace the panel circuit board, troubleshooting.

9 automatic coffee machine extractor stuck water tray, resulting in boot can not go up and down, water tray and extractor can not be taken out

It is estimated that this fault is caused by the customer not cutting off the power plug correctly. Open the back cover of the machine, receive the rotating belt pulley, make the extractor rise to a slightly higher position, and then check the power supply, start the machine, and eliminate the fault.

10 Delong EAM3000, 4000 series coffee machine, just started to make coffee, the knobs and buttons on the panel function normally, but after 2-3 cups, the knobs and buttons function confusion, such as rotating the coffee powder knob, the water shortage light is always bright.

Replace the panel circuit board, troubleshooting, but carefully observe the coffee machine working process, found that steam leakage at the boiler interface, estimated that steam into the panel circuit board, resulting in panel function failure. Replace boiler seal washer 5332107700, troubleshooting.

11 extractor can not be taken out, observe the extractor at the top. One, two, alarm lights on.

After entering the function test mode, the extractor can move upward, but cannot move downward. After inspection, the extractor motor is broken, replace the motor, and troubleshoot.

Normal voltage at both ends of the motor, when moving up, F8 is positive voltage, F7 is negative voltage, voltage value is 200V, after reaching the top, the voltage disappears, 1 cup light is on. Press the 2 cup key to try, the extraction part goes down, F8 is negative voltage, F7 is positive voltage, voltage value is 200V, after reaching the bottom, the voltage disappears, 2 cups light up.

12 One cup, two cups, warning light on.

It may be that the extractor motor is bad. Generally, the motor resistance is about 200 ohms. If it is too small or open circuit, it should be judged as motor damage. Because this motor is DC motor, so the measurement motor needs to hand turn to the motor, each gear is measured resistance.

If the resistance is too small, it is possible that the circuit board is also damaged, so the circuit board cannot be replaced first, so as not to burn the circuit board again by the motor. If the power supply is plugged in and the relay sound on the circuit board is not heard, it is estimated that the circuit board needs to be replaced.

Coffee comes out dripping, not flowing.

After the automatic coffee machine is purchased, the first few uses are normal, but after several uses, the above problems will occur, and the thickness of the coffee powder is also normal. At this time, it is necessary to check whether there are two metal filters on the extractor. If there are two, remove one, and the fault will disappear.

Source:

Vinny Town Old Blog