Using the RESET procedure located on page 2 of this User guide may rectify the fault. The indicator neon will illuminate but there is no hot water. Ensure that the Water Heater Switch on the front of the Electronic 7 is in the Timed position. If this fails to rectify the problem please contact a local heating engineer or qualified electrician.. Electronic 7. User Operating Instructions. The Horstmann Electronic 7 Water Heater Controller has been especially. developed to control the immersion heater as economically and conveniently. as possible. During the night, water in the tank will be heated by cheap night-rate. electricity, ensuring a tank of hot water is available for the morning.

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• Electronic 7 is fully interchangeable with all past and present Horstmann/Secure Economy 7 controllers • Built in clock - automatic Summer / Winter time change • 'Boost' button • Timed boost programme • Up to 3 Off-peak settings per 24-hours. • Programmable and manual boost • Programme security feature • Long-life.. Download this manual. Enlarged version. Mounting. The Electronic 7 should be removed from the mounting box by unscrewing the 2 captive screws. securing the unit. Conduit Box Mounting. Use either holes marked 'A' in Fig.1 to secure to a single gang box, or the two holes marked 'C' for. a double gang box.