Hello my friend has a goodman gdh8070 furnace with a 4 flashing lights on the board (open hight limit) i put a wire between the purpure wires to close the circuit, blower run, combustion fan run but not heat i inspect every part but they are good when i conetc the switch back 6 flashing lights apear on the board what could be the problem i have some ac and electrical knowledge *** help us thanks omar

4 is limit, not sure what 6 would be. You woill have to check the back of the furnace door, usually 6 is a presuure switch never opened code. Did you jumper all the saftys or just the high limit??