Bosch dishwasher SPS40c12gb rinse and check water lights

Rinse aid and check water lights flash rapidly as soon as power switched on. Is there a way to reset?

The machine had been working fine, until the customer poured bleach into the sump, on the recommendation of a friend. Apparently it foamed up and now will not do anything. Unfortunately the customer was not at home during my visit so I couldn’t ask how far into a cycle it had got, although it had drained.

No evidence of water in the base. I’m wondering whether damage may have been caused to the heat pump due to the foaming and consequent low water pressure round the system.