Aiyub,

Is the evaporator not frosted?

If ventilated, are all the fans running?

If fans are running, are all the bottom plates (air guidances) in the correct position so that air can only pass through the evaporator? Perhaps someone (another tech or the client after cleaning) replaced them in the wrong position. saw this fault many times.

In some units I know - if a multideck is that what I think what it is - there is sometimes in the perforated back some sort of air difuser (honey-comb structure) This blocks sometimes due to the dust.

How do adjust your BP? With the spindle on the TEV?

Air on/Air of are °F I presume.

What was the initial reason your client called you Aiyub? Is he having already longtimes problems or did this happened in the last days? Sometimes you can learn something from his story.