Is this a thermastatic mixer as oposed to a manual control.
If it is then it could be a problem with unequal water pressures on your supply. If you have mains water pressure cold and hot from a gravity feed tank system not all mixers will work. The mixer will treat this as a fault and shut down to prevent scolding risk etc. Check the type of mixer you have against type of water feed. You may need to make alterations to your feed to equalise pressure
Robin S
September 2008
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix plumbing.