Support for all of your ESI Products

Room Thermostat “working backwards” – switching off at higher temperatures and on at lower temperatures.

The “Heating ON” terminal in all products is the “Normally Open (NO)” terminal – if the output to the Zone Valve / Boiler is connected to the “Normally Closed (NC)” terminal in error then the thermostat will appear to “work backwards” – simply reconnect to the “Normally Open (NO)” terminal.

Related FAQs