Do you think it is worth trying the board suggested and a newer flame sensor that looks identical to my current one?
Or should I just replace the furnace with a new NT-30-SP?
I pulled the whole unit yesterday and cleaned out the gas lines, (from the supply bottles to the furnace), installed a new main gas regulator, cleaned the burner assembly, re-soldered the control board on two questionable connections, continuity checked all the wiring and the sail switch. I also pulled the flame sensor and checked it’s position. The flame sensor seems to be working okay but is getting distorted on the ends over the burner. See attached photo.
When reassembled and installed it fired up correctly and ran great through the first cycle. I turned it off when the thermostat opened. After letting it cool down I started it again. Now it is running 30 seconds on and 16 off.
I hate to spend $120 on a lost cause just to find out it is time to replace the unit.
Thoughts, advice, recommendations?
Anything will help...