That is a model code that flashes on the display on startup selftest, i've seen it too many times :o)
ifsmike is most likely correct, check your switches.
Also...
If the unit will not complete it's selftest then you can pull the cover off the controller and check the ribbon cables connecting the boards, zapi have a service bulletin on this problem and their solution was to do just this, remove the cover, check the ribbon cables and use silicone on the cable connectors to hold them in place.
Note: use extreme caution when removing and retorquing the power cables on the standoff's on the controller , if the standoff breaks loose from the plate the controller will have to be replaced. They are only cold soldered to the plate so they can easily break off from the plate they are mounted on if too much force is applied.