We study process of recovery of optical properties of thin polyaniline (PANI) films, obtained by electrochemical deposition method after ammonia impact on it. We show, that heating of sensitive element of the gas sensor based on PANI films with simultaneous air blowing leads to their effective regeneration and provides multi-reversibility of the sensor performance. We find that optimal temperature value for recovery of the optical absorption at wave length 600nm of thin PANI films after ammonia impact is equal to 80 degrees C.