I called Folkes in the middle of the night and they had someone there (Dan B.) within 30 minutes. You can’t ask for better service then that). Dan had to do a lot of troubleshooting since the problem was very unusual. He systematically checked each part of the furnace until the problem was found and then quickly repaired the furnace and had it up and running. All I can say is that if your furnace goes out, these are the people to call.