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HI, I'm looking for some advice from someone who may have encountered my problem before. I'm a gas engineer and i have been trying to solve an issue with a baxi duo-tec 28 HE. The boiler randomly calls for CH when the thermostat is not, the green LED lights up for around 5 minutes before deciding to fire up. I have exchanged the old thermostat (Salus) and replaced the primary ntc sensor and still have the same problem. Baxi technical are adamant that it's the new thermostat but like i had said it is brand new. Can anyone help me at all? Thanks.