"jonathan" wrote in message
...

Thanks for the replies,
Not sure if it's a safety feature but our mixer won't do hot only - it
seems to mix cold with it. However, I tried the "turning it to full hot
and lowering the shower head".
Result - no spluttering, just powered cold water.
As I said you can have a perfect temperature shower as long as you
don't want it powered. As soon as you throw the switch for the pump -
it turns cold.

Any more thoughts?

Thanks
Jonathan


Are there any isolator valves to the shower pump? If you find some, then
try turning the cold supply side down a little until the shower balances
properly.