Have a 25 plus year old furnace pilot will start when signal sent furnace tries to start makes noise as it tries over and over but will not start.
Thanks

Clean the flame sensor. I am sure glad you posted the model number and brand. It made my universal answer so easy to give.LOL

Rich, I have a 25 year old car, any idea what spark plug I need? Hvac1000 can laugh about it but we are professionals taking our time to help you. Without a make and model number, you are wasting our time.

Sometimes I just wonder about people and how they survive.