I have a thermostat in the hallway and a thermostat on the hot water cylinder. The problem I have is that the hallway thermostat seems to dominates the hot water one – i.e. if the water temp is below the required 55/60 degrees, the boiler won’t heat the water when required UNLESS the temperature in the hall is lower than the required temperature on the hall thermostat. The CH system has hot water priority. Any help greatly appreciated.Is this normal?