Discussion in 'Refrigerated Trucking Forum' started by mecky1, Oct 10, 2021.
I have a 2009 carrier unit. This code keep coming up A18 and A56. Can someone help me
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Code 56 check airflow
Code 18 LOW REFRIGERANT PRESSURE
Fan clutch might be bad.Go in back of trailer with unit running and check if any air blowing into the trailer
Lower refrigerant pressure and low airflow? I suspect your coils may be icing up.