Upon arrival, system is locked out on low pressure code. Unit fault history has a number of low pressure and fp1 sensor error codes indicating low refrigerant charge. Tested refrigerant pressure and found 0.7psi in the system. The system has had a major blowout. Perform leak search in attempt to find refrigerant leak on Waterfurnace 5 Series package system. Could not pinpoint leak but was able to isolate the leak to somewhere in the outer wall of the domestic hot water generator coil. Visible oil on and around the area hinted to the location. Infrared sniffer was picking it traces of refrigerant from the area but could not pinpoint with leak detector gel. Hot water generator coil, aka desuperheater coil, will need replaced. Called Waterfurnace for warranty status and availability. Part is covered under warranty, but labor and refrigerant are not. Prepared quote for replacement. System can currently be ran in emergency heating mode for heat.
