Citroen C4 2014

[Davidmc0033]

Morning everyone, quick question about the heater on the above, wasnt working so took a flyer on the blower, put a new 1 in along with the resistor, still not working, wired the original unit to power and it works OK, so refitted original unit, 3 or 4 days later it decided to work the cut out and not working again , has anyone come across anything that could cause it , ie wire chaffing or poor connection ,thanks