I have a Rheem heating/Air conditioning unit. I have checked all the possibilities I can think of. The pilot light is on, the electricity works, all filters have been changed, and the unit does go on when the temperature drops. It's all cold air. The system cannot seem to stop turning on and off because the house is still cold. When on and ready to heat up the heat mechanism does come on and I can see the flame inside blowing into the furnace, but only for a minute then it completely shuts down. IT stars up again within 4 minutes or so then tries again with the very same results.

Model #RCBS-3765GG17BI

Can you give me some new suggestions? It's 62 degrees in here. :confused:

Thank you in advance.

You could be faced with many different problems.Limit switches/fan switches etc. best to have it checked out by someone who knows what they are doing.

Go to the sticky at the top of the forum. If you follow the sequence of operations under gas furnace, I think you will find the problem is the blower is not starting. The motor could be bad, or the relay on the control board. Post back with details. Many people have fixed their furnace with help from here.