The drencher in my shower has started to drip cold water when the shower is in use which should not happen as the control is set to shower not drencher. This is a bit uncomfortable during a shower and it only happens when the shower is in operation. Any ideas please as to the reason for this?
Try routinely running it as a drencher for a few seconds at the start of each shower - until warm water comes through.
I had a similar issue which seemed to be caused because I rarely used the drencher and something had dried out somewhere in the system, allowing a small leak into the drencher when the shower head was being used. This has been completely cured by the method I suggest above.