Our shower has worked all the time no problems, then out blue stopped working while in it. The control dial was filled with water, I took it off and dried it out. Hairdryer at first ,radiator then airing cupboard.put it back on the shower started, but now has stopped.the dial is flashing red. Recently our radiators had air blocked which was done. The plumber stopped something in the attic and got it going.would this affect my shower?What wrong with my shower please advice.