Codes de défaut couverts
18-11
Code 18-11 indicates that the equipment is reducing compressor speed compared to the requested capacity demand in an effort to prevent ice accumulation on the indoor coil. The PCM monitors the saturated suction temperature at the compressor, and when the saturation temperature approaches freezing, the compressor speed is reduced until the saturated suction temperature is raised. Prior to reducing compressor speed, the equipment will first attempt to increase indoor airflow, if possible. If the airflow increase and compressor speed reduction are not able to achieve a saturated suction temperature above 32°F then it will continue to operate until either demand is removed or a 32-15 (Compressor Low Pressure Limit) occurs.
Code 18-11 can be caused by insufficient airflow across the indoor coil due to a dirty filter or restrictive ductwork. Code 18-11 can also be caused by insufficient refrigerant charge in the system. Check the indoor equipment for excessive static air pressure and check refrigerant charge levels to correct this fault.
Pages de dépannage ACHPVSR454-02SM.