Our local water authority has cut of the mains supply several times in the last few months to fix a major leak. Every time they have, we have experienced fitful (fizzing) operation of our Mira shower on reconnection. The water coming out is full of air and it takes several days to 'bleed' the system through the shower head. This time, the thermal cut-out has tripped and I'm assuming that the heating chamber has collected air directly below the sensor. Unfortunately there does not appear to be a 'bleed' nut to release any trapped air at the top of the chamber. Any ideas? - rotating the shower is not practical given the connections.