On arrival, I found the emergency water safety switch tripped due to a restricted drain like. I first blew out the primary line and then inspected the drain system. Found a male threaded fitting loose. Removed fitting and applied new PVC cement and secured fitting into the primary line. I then inspected the primary pan for any water leaks and did not find any cracks inside the pan. I applied a bead of silicone to the pan weep hole plug. Reset the cooling system, blew out the drain and then flushed the line again. Verified everything was operating within manufacture’s specifications for operation. Everything is working at this time.