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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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Electric Relay (Low Voltage/Volt free connections or Switched Live connections)
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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.
Pagebreak
Electric Relay (Low Voltage/Volt free connections or Switched Live connections)
...