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Thanks for the response. Phoned Horstmann for advice - very helpful person thought the controller rather then heating elements at fault, as neither is working - apparently if the red "off peak" light is permanently on then the "boost" option cannot work (safety reasons). He suggested a new...

Please help : I have a water tank controlled by Horstmann maxistore econ 7 quartz controller. The water tank has 2 heating elements wired separately into the controller (a lower one for "timed" overnight econ 7 heating and one higher for "boost" option). The red light on the controller is on...