Furnace Repair Complaint No Heat. Cause of the issue was a bad control board. Board will trip low voltage fuse anytime there is a call for the igniter. Board is under parts warranty under late January of 2024. Quoted 2 hours of labor to customer. 12/12/23 After running multiple tests, cause of the issue was the gas valve. Replaced gas valve under parts warranty. System is operating normally at this time. Customer will be in to pay the remaining balance of $48 at the end of the week.