what can be the cause in making the shower to overheat is just not possible to have a shower because the water is coming in sequences hot/cold and the overheat light is coming on. I was wondering if you can advise me what can be wrong and also where I can get the faulty spare part .

johnny g, February 2009

The most common cause of this is a flow problem.
if the shower head is blocked with limescale or the hose is kinked, then flow rate is greatly reduced, this results in the water being overboiled (hot flow) and a safety cutout activates disconnecting the heating elements resulting in a cold flow which resets the safety cutout and the same cycle starts again.

try disconnecting the hose and shower head and checking if it maintains temperature. if not then there is a filter within the machine which needs cleaning. this applies to all pumped electric showers

Dave, May 2014