Headrush
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If you adjust the control up and down, you should hear it click on and off and see where it is doing so. When it is on, the heating system should come on and hot water will flow to the cylinder and heat the water inside. If this does not happen it usually points towards an electrical problem with the system like the 3 port valve for example, depending on your system.
A voltage test on the thermostat output will determine if it's working ok or not.
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