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Thermostat change

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8 Oct 2025
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Hi, looking to replace my old RTS1 3 wire wall stat for a Drayton 2290B 2 wire programmable model, is there anything that I need to know regarding the wiring. This is to control a combi boiler.
 
Assume the 2290B is the battery version? so you wont need the neutral and will need to be put in a wago or something similar to keep it isolated. Isolate power to thermostat, boiler, controller etc.. prove dead then complete wiring as per the installation guide.
 

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