Hi all, I know I need to go back to the tradesman who fitted this but I would like to have a reasonable idea what the issues are and how they should be overcome before I speak with him. We have a gravity fed hot water system with a loft cold tank, an immersion in the airing cupboard, and a gas boiler. There was an existing shower pump in the airing cupboard serving a mixer shower in the family bathroom, and we had an ensuite with a bath but no shower. We have now had an Aqualisa Quartz mixer shower installed in the ensuite, which has a digital controller with mixer pump and diverter in the loft. We were told this would work fine along with the existing shower in the family bathroom. All good, until someone tried to use the original shower at the same time, then no water comes to the original shower. Looking in the airing cupboard it appears hot and cold for the new shower have been taken from the pipes just before the pump for the original shower, which to me seems wrong as I would expect that might cause this problem. Is it as simple as that, and what should be done? Here's a photo of the connections.
Thanks in advance.