Make sure the turbine can turn over with just a butterfly breatheing on it. The starter should be able to spin the rotor to 2,000 to 3,000 rpm easily in order for the propane to ignite for the preheat cycle. Monitor the read out during initial start up. Check to see that the RPM's are reaching this point. If not there's a problem with either a loose connection somewhere, a dragy starter motor, or possibly a battery issue. You can also monitor the voltage on the second screen. If it drops too low a condition may exsit where the current is increased to try to make up for the voltage drop. Same condition may exsit with a loose connection. DO you have gas ignition?
See what you come up with.