My Bosch Maxx has te "Active" light flashing?

After some mains high water pressure problems in our house, my 10 yr old Bosch has stopped working. The "Active" light is flashing. Is that because I now only have a cold water supply connected, or is it because the pressure is too low? There is no water entering the machine.
I used to have both Hot and Cold hoses connected, but the high pressure burst the seal on both connections. The mains water pressure is back under control, but I have only been able to replace 1 seal at the moment. The cold water hose is connected and turned on.