2 control lights are blinking on the Lagan DW60 GSP, why?

Hello everyone.

With my dishwasher LAGAN DW60, the two upper indicator lights blink (only when I turn the machine ON).

The manual says nothing about it (it's not due to salt or rinse aid).

The customer service says it could be something serious and a technician needs to come.

Now my machine is 2.5 years old (!!) and just out of warranty, so I have to pay for the technician entirely myself.

Does anyone have an idea what the two indicator lights might mean? And what should/must be done?

Thank you very much for your help!

Google with Bauknecht or Whirlpool dishwasher or try it at teamhack.