No heat. Joe(JC)R. 02/20/2025 I arrived to a call where the customer said that the furnace wasn’t heating. I found that the 90% furnace drain line had frozen. The drain line looked like it had once had insulation but had been removed. I got permission to thaw the drain line and install a heat tape and insulate the drain line. I also inspected the drain line for cracks and inspected the furnace. After thawing the drain line and installing the heat tape the system is running well. The customer signed up for a maintenance plan.