Blinking lights: Stuck on blink-off-double blink sequence.

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Kf machine without use for years. A friend gave me to repair.
It is similar to model XN2140 with a guide from https://es.ifixit.com/User/3864113/mark.... who helped me to fix this one.
The Manual of course says in this case must call the Tech Service. The offcial manual does NOT mention what I found. The device was repaired without unscrew.

I tried every play with buttons like the one from mark.ladd or the reset sequences etc. But light keep blinking on the same sequence. For this model all the tricks are using the LUNGO button in combination with the power switch thas was not fixing anything to me...
So I decided to try with the SHORT button even it is not documented. When switching on AND with the short button pressed, the pump started to work intemettently. But no water circulated.
As I have repaired other KF machines I noticed the sound was like the pump unprimed (air on the circuit). So I keep trying to prime the pump, the sound changed and the water started to flow normally. The machine works perfectly without screw nothing...just "listening". Hope this helps similar symptoms.