I have an old honeywell thermostat that uses y,r,g,c,w terminals ony, how do I wire in a new thermostat that has o/b,y,g,w2,e,c,l,r please help!! I already blown one transformer.

You might not have the correct thermostat.

Brand and model number of old thermostat?

Brand and model number of new thermostat?

Well the old one is a honeywell not sure of the model (it has a timer and it is rectangle. The new one is a white-rogers model 1f82-261