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Label your wires
N L
1
N
L
1
Earth
Backplate
If replacing, take a picture of your old thermostat
connections, label and re-wire as shown in
Secure Controls installer app.
16
2
3
4
2
3
4
Earth
Pin
Label
N
Neutral
L
Live
1
O 1
2
COM
3
On 1
4
On 2
Note: NC - Normally Closed, NO - Normally Open
Pin description
Neutral
Live
Hot water OFF (NC), channel 1
Common
Hot water ON (NO), channel 1
Heating ON (NO), channel 2
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