Cleaning Sub-Zero Condenser To clean the Sub-Zero refrigerator condenser regularly is possibly the most important maintenance practice to avoid future repairs. Refrigerator coils collect dust and dirt over time, reducing cooling efficiency and causing the compressor to overheat. In most Sub-Zeo models, condenser coils are located on top of the unit. In some older models, they are located on the very bottom. The best way to clean condenser coils is to use a soft brush. Always move brush up and down in the direction of the condenser fins to avoid bending of the fins. Condenser cleaning is recommended once a year. If you are unsure how to handle this work and you would like a professional to do it, please call us today or schedule the service appointment online. (619)339-5682 (858)208-3549 contact@mdappliancellc.com