Tom M. 2-25-25. Silver club furnace maintenance. Cleaned flame sensors and set gas pressure. All electrical components test within manufacturer specifications. While visually inspecting the heat exchanger noticed the larger furnace is cracked in two spots. I have shown the customer on my camera at the furnace as well as photos. He has refused to sign the heat exchanger failure form and stated he doesn’t want to take any action.mi have advised the customer there is no Co entering the home at this however I have recommended not running the furnace due to a potential health and safety concern due to the heat exchanger being breached.