The way you have them connected:
If those are 2 ohm resistors they'll draw about 13.5 amps each and dissipate about 365 watts each. The set of 6 will be drawing 81 amps - far too much for your controller and dissipating 2190 watts.
If they're 1 ohm they'll draw about 27 amps each and dissipate about 730 watts each. The set of 6 will be drawing 162 amps and dissipating 4380 watts.
So it's no wonder your controller decides it's being overloaded and immediately cuts out.
Presuming you haven't already fried the controller:
If they're one ohm resistors: Hook two in a parallel group, three in another
parallel group, and hook the two groups in series. (Keep the 6th one for a spare.)
That will give you 0.833333 ohms, draw about 32.4A and burn about 875 watts. Maximum dissipation will be in the two-in-parallel group which will be burning about 263 watts.
If they're 2 ohm: Parallel three groups of two-in-series. That gives you 1.33333 ohm, 6.75 amps each pair for 20.25 total, 91 watts each for 546 total. Puny but safe.
Another hookup for 2 ohms: Hook two in a series group. Then parallel that group with two individual resistors and keep the last two for spares. That will give you 0.8 ohms, draw about 33.75A and burn about 910 watts. Caution: In this case the singleton resistors in the parallel group will be dissipating about 365 watts well above their rating. So be sure they've got forced air cooling and are in a protective box to prevent flying sparks. (If they fail they'll fail open and reduce your dump load, rather than throwing the load onto their partners and setting up a chain-reaction failure that leaves you with no load.)
Do these resistors have adjustable taps? If so there are other ways to connect them to get what you want without overloading the resistors.
