Brennan G Today I visited for the system not defrosting. I preformed a complete system inspectionm We determined that the outdoor sensors have failed and the system is not going into defrost. I provided a quote to replace the sensors. Throughout the inspection. We discovered many concerns with the system regarding its age and condition. The condenser coil is corroded and the fins are falling apart near the bottom of the coil. One side of the coil is extremely impacted with debris. Due to the corrosion on the coil it cannot be cleaned and will likley start leaking refrigerant. The air handler cabinet has experienced previous condensation issues. This is evident in the corroded ground wire and visible water damage on the ceiling. The air purification system installed is not functional. The system has no primary drain line float sensor. We discussed possible system replacement with another carrier infinity system. This would be the best choice for an installation due to the zone systems