First checks whether there is a leak phenomenon, through inspection line did not see oil stains, check found in the high side pressure on the high side, outdoor doubt capillary dirty plugging, but through inspection of capillary is not blocked, then check the indoor and outdoor unit connection pipe, remove the thermal insulation layer, found that low pressure pipe to the compressor section of frost, but no frost, indoor side that outdoor pipeline jam, check found a crease line outside, but not completely closed, cause high pressure on the high side, low pressure is low, the refrigeration effect is poor. Replacement of low pressure pipe, and filling and fluorine, troubleshooting.NyJservice manual download site