EC 10228-0905 is the third pulsating sdB+ star to be announced. High-speed photometry reveals three periods present in the range P=139-152 s with semiamplitudes of less than 10 mmag. All periods show evidence of variable amplitude. Pulsation models have been calculated for sdB stars with log g similar to 6.0 and T(eff)similar to 35 000 K. These all have radial and non-radial modes with periods in the observed range. No unique mode identification is possible at present, but it is clear that at least some of the modes are non-radial. No stars have been predicted to pulsate in this region of the Hertzsprung-Russell (HR) diagram and the cause of the pulsation is not yet understood.