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when running a bath the central heating comes on?

When I run a bath my central heating comes on .on my potterton performa h30 system
john, September 2013
Your diverter valve is almost certainly passing.

See

http://www.diynot.com/forums/viewtopic.php?t=285026

ChicksFan, September 2013
link Click here to see other fixes for Potterton.