Control system for one or more ablutionary devices

A control system for one or more ablutionary devices, comprising:

• a mixer valve having a first inlet and a second inlet configured to receive a supply of hot and cold water, and an outlet configured to output cold water, hot water, or a mixture thereof as an output stream for supplying water to the one or more ablutionary devices downstream of the mixer valve, the mixer valve comprising first and second valve members arranged to control flow between the inlets and the outlet;
• and
• a controller in communication with the mixer valve, the controller configured to:
• control the mixer valve of one or more target output water properties, the controller configured to control the position of the valve members in order to control the output stream;
• obtain one or more operating signals each related to an operating parameter of the control system, wherein the one or more operating signals include a hot water temperature signal indicative of the temperature of hot water flowing through or being supplied to at least one of the first or second inlets, the one or more operating signals including a target or actual position of the first, second, or both of the valve members;
• and
• generate, based at least partly on the hot water temperature signal, a diagnostic signal that indicates an associated failure mode of the water supply if the mixer valve cannot be controlled to reach the one or more target water output properties, wherein generating the diagnostic signal comprises comparing the valve member target or actual position to a closed threshold and an open threshold, and determining which one or both of the valve member positions are below the closed threshold or exceeding the open threshold in order to determine the failure mode indicated by the diagnostic signal;
• wherein when the diagnostic signal is generated, the controller causes at least one of the following actions to occur:
• transmitting the diagnostic signal to at least one of a user interface and a remote device;
• and
• transmitting the diagnostic signal to a service company.