hot and cold mixer shower cant get it to mix properly.Single leaver shower.Either too hot or too cold cant get a happy medium any ideas would be greatfully recieved

sean nicholls, March 2009

The hot and cold pipes have been connected the wrong way around; this means that when the thermostat tries to cool things down it's actually adding more hot water instead, and vice versa. Either swap the pipes, or get a reverse thermostat cartridge.

Tom, December 2014