Arrived onsite for freezing line set in AC mode. Performed diagnostic and found system significantly low on 410a refrigerant. 50psi. Performed quick nitrogen test. Placed system under 245psi. Used bubble solution to inspect for leaks. Did not find a leak. Did not hear hissing of a leak. Left system under nitrogen pressure 245. Will send estimate for isolation nitrogen pressure test to determine where the system is losing refrigerant.
