No heat. Joe(JC)R. 12/19/2024 I arrived to a call where the customer said that the furnace was lighting and was flashing a code. I found that the gas valve wasn’t opening and was get a signal from the furnace board. The system has gas to it. The customer wants to wait and make a decision on whether it or not to repair or replace the system as it is old. The customer’s only has a furnace and no AC