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I bought Nest Gen 2 a few years ago. Didn’t realise the thermostat connects to heat link via mesh, and so they have to be close. Our boiler is upstairs, but for obvious reasons the thermostat has to be downstairs. Many times we’ve woken up to a cold house because the thermostat lost connection...

My boiler doesn't want to heat the radiators, but it responds immediately to the hot tap being turned on, and heats the water no problem. Boiler: Worcester Bosch 28i Junior (approx 3 years old) Thermostat: Siemens RDJ10RF This is an intermittent fault which started about a year ago and is...