This is a busy day. The A/C controller went through the night without error. this was a nice accomplishment. Lib also tested it by turning it on manually. A little while later it managed to turn the A/C back off. It samples the power every half hour. If it gets a synch error, it samples it several times then changes the synch status. This causes the temperature routine to notice and correct the A/C power state. Lots of different processes here. Built the people picture section of the AVSA DVD this morning then went outside and finished putting the hot tub back together. Everything seems to be working again. Filled the tub with water and set up a temperature monitor. It doesn't seem to be warming very fast.