System didn't seem to be heating properly, I call they came out a few hours later, tech discovered faulty thermostat and controller board. Tech replace faulty part and discovered zone 1 on the controller board was bad, Tech rewired controller to use zone 3, so I would have heat. They had to order the new controller board, as the old one had other issues, the rewire couldn't fix. I wasn't left in the cold, I have heat. Tech was very through, knowledgeable and professional.