Service call back for tech. Customer note that CO Detector going if at 150PPM on perk reading. Check and did not detect problems at this time. Checked all 3 gas furnace and hot water and found systems operating with low Ppm of co and venting out of building properly. System operating between 15 to 25 ppm of CO.(normal range). The building was closed for the weekend and no machinery was being used. The gas heat was not running due to the warm temperature. Tech did not detect a leak at this time. If this happens again will need service manager to have a visit.
