Hi rachelfryer You need to check if you have full flow from the hot supply - turn your shower to fully hot. If you get a good flow then if it is a thermostatic shower then it's probably the thermostatic cartridge. If you get poor flow you need to check if there is a filter (which may be partly blocked) or a non return valve (which is sticking). I'm assuming you have checked all valves are on. Regards S
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