Error 2D26 and Glow plug system light blinking (diesel engine)

Hi. My skoda octavia break 1.6tdi from the year 2013 (last production year) woth around 130.000km  started blinking the glowplug system light in orange color. The engine subsequently entered safe mode and lost inherent power. At a Bosch Car Service, they connected the car to the scanning machine and it replied with error 2D26. They do not know what this is. They deleted the error. Since then, I have now picked the car up and driven it for 10 minutes to work and it worked normally and no lights were turned on. 

Does anyone have any insights on this matter? Thank you in advance.
miguel