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The Electric Switch and Temperature Probe, which is used to measure the temperature of the Hot Water Tank. The Electric Switch must be wired into a switched,  fused fused spur near the Hot Water tank.  Place Place the end end of the Temperature Probe into the pocket/under the insulation of the hot water tank.  The Electric Switch and Temperature Probe, which is used to measure the temperature of the Hot Water Tank. The Electric Switch must be wired into a switched, fused spur near the Hot Water tank. Place the end for the Temperature Probe into the pocket/under the insulation of the hot water tank

If the Hot Water Tank has an immersion heater backup, this can be wired into the Electric Switch (output) so you can also control the heating of the hot water from the immersion heater as well as the boiler. If the Electric Switch is wired into the immersion heater, it should be covered by the same switched, fused spur as the immersion heater. 

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1. Always ensure that the boiler, immersion heater and wiring for the Electric Switch is electrically isolated before you commence work on any wiring.
2. Locate the existing tank cylinder thermostat for the hot water tank. 
3. If the same pocket as the cylinder stat is accessible, insert the Temperature Probe into this pocket.
   1. If it is not available, attach the Temperature Probe to the outside of the tank (under the insulation) using a thermal paste so it gets an accurate water temperature reading and has good adhesion.
4. Break out the relevant section of a 1-gang pattress for the wiring, allowing for the temperature probe to exit the pattress box if applicable, and fix the pattress to the wall. It is recommended that a 40mm pattress is used.
5. Pull through the relevant wiring, allowing plenty of spare.
6. Wire in the Electric Switch as per the wiring diagrams provided, checking this is suitable as per the relevant installation manual, such as immersion heater.
7. Remove the front cover of the Electric Switch to expose the screw holes. The cover can be removed by placing a flat bladed screwdriver into the gap underneath the Electric Switch and levering in a downwards direction.
   
8. Fit the Electric Switch into the pattress, ensuring there are no trapped wires. Screw in using standard pattress screws, and check the unit is securely and safely attached to the wall. Re-attach the front cover starting at the top.

In normal operation there will be no lights when the unit is not heating and one or more red lights near the button when heating.

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