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Replacing room thermostat wiring
Greetings. I am wishing to replace my ancient room thermostat with a Horstmann digital 7 day type. My old thermostat has four wires, earth, plus a red, yellow and a blue. The Horstmann unit is looking for two connections although it has three connections available, NO, NC, COM. Can someone tell me how I should proceed?
Cheers. John. |
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