Rheem Furnace switched to propane with kit, pilot light lit but bar won't light. The black wire from furnace an one from controller what terminals do they go to to make the bar turn on

If you have 24 volts at the gas valve and its not firing the pressure may be set wrong on the valve. You need to use a manometer to get it set.

T-Top is correct in what he told you but I feel obligated to go one step farther.

Natural gas to Propane conversions should only be done by a qualified heating professional with much experience. As mentioned before special tools are needed to make the proper adjustments and one false move with Propane will make you a very unhappy camper. It is always better to be very safe than sorry.

Thank You both It was pros that hooked it up a couple of years ago but husband unhoked blower to get it fixed now were having problems to get it to work again

Sorry but this situation is confusing to me. On one post you asked what N and C were then here you said.

Rheem Furnace switched to propane with kit, pilot light lit but bar wont light. The black wire from furnace an one from controller wht terminals do they go to to make the bar turn on

OK I thought you just converted to propane but now you say it was done years ago. Then you say that your husband unhooked the blower to get it fixed and now you are having a problem getting it going.

The blower has nothing to do with the pilot light or the bar (what bar ?) that won't light? SO tell us again what is the real problem? What is the real model number of your furnace?