WiFi Thermostat Installation

[Chris Strawson]

Please can someone help before I knacker the boiler, we have just moved in our house and there is a Worcester Greenstar Heatslave 2 oil combi boiler. It already has an old dial thermostat which apears to have Live, Neutral and Earth wired into it, I would like to change for a WiFi one, the Wifi one is a Beok style do I just swap it out and put the Live and Neutral In the corresponding inputs on the Wifi but I've also read that a SL? needs incorporating somewhere on the new WiFi thermostat is this correct please and if so where and what do I need to do thanks 8n advance....Cheeers Chris
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[Stu-B]

That’s not a neutral, it’s a switched live. Get someone in before you have an accident mate.