Ariston Velis Evo troubleshooting probes and repair

The boiler does not heat water, all LED's flash for a few seconds and then turn off. After switching on, the LED's flash again.

There is no relay click when turned on.

While the lights are lighting up, press and hold the power button until one, two, or three lights remain lit steadily.

The processor will display an error code, with 40 degrees being code 1, 50 degrees being code 2, and so on up to 5.

If the code is number 3 (60 degrees), it means that one or both temperature sensors are faulty.

Error codes: 1 or 1&3 - defective electronics, 3 or 2&3 - faulty temperature probe, 5 or 2&5 - one sensor has read too high temperature, 4&5 or 2&4&5 - excessive temperature (electronic failure), 2&3&4&5 or 3&4&5 - excessive heating due to lack of water, 3&4 or 2&3&4 - faulty heater.

Turn off the mains switch and make sure there is no voltage at the input contacts (L and N).

Remove the screen by using a flathead screwdriver to pull it towards you from the bottom and then from all other edges.

Remove the probe connector from the display electronics. The probes differ in width (8 and 10mm), do not interchange them!

Measure the resistance between the red and yellow contacts, as well as the red and brown wires, with a multimeter. The resistance at pair of pins should be about 12 KOhm and about 14 KOhm at a temperature of about 20 degrees Celsius.

If any of the resistances differ significantly from those specified, the probe is defective and should be replaced.

Disconnect the probe and pull it out.

Put a new probe but do not bend it or you may damage it!

Connect the probe to the display electronic.

Connect the mains and push the power button. Now it should work as normal.

If display is still flashing and there is no clicking sound from relays, the main electronics should be checked and possibly replaced.

If the screen works normally, but the water does not heat up even a little in 20 minutes, the heaters should be checked.

The resistance at the heater contacts should be about 36 Ohms and infinite Ohms between the contact and the heater housing.