Tech arrived to a warranty No Heat. Upon arrival the thermostat showed 50 degrees and was in the off position. The thermostat was switched to heat and the system was evaluated. The control board was flashing with 3 red flashes possibly indicating a pressure switch problem. The pressure switch was bypassed and the system regained functionality. The pressure switch was replaced and the system was tested multiple times. The heating system reached complete ignition each time it was tested. The customer was given information about Duct Cleaning, Media Filtration, Surge Protection, and Electrical Audit benefits. The system was functioning upon departure