No Heat - Basement System 22 year old Ruud gas furnace and AC. System not heating due to age. The limit switch has been tripped multiple times and the board is flashing a code for open limit. I jumped the switch out and the board was still flashing code for open limit. Observed that there is a burnt area on the main control board and this section of the board is bad, bad board and switch. I used my bore scope camera to look at the heat exchanger to see why the limit has been tripping. The heat exchanger is compromised and no longer safe for heating operation. The blower wheel is dirty, the blower motor is dirty and seeping oil that is staining the case. The gas ran to this system is not hooked up properly and not up to code. The igniter is weak and original. The inducer motor is over amping and the bearings are worn. Due to the age, condition, and cost of temporary repairs, homeowner requested. We send out an install supervisor to go over updating the equipment. Thank you for choosing