Baxi 105 HE not working?

I had a leak behind my washing machine causing the boiler to have low pressure and to stop working. I fixed the leak. Now the boiler ignites and heats the radiators and water for about 15 mins, but then shuts off. I noticed the pressure dial going up to around 2.5. At resting it is 2 and the red light is flashing at the triangle 60 deg symbol.
Not sure what to do?? I have no idea about boilers.