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So how hard can this be I tell my wife, darling it might look difficult but it’s just a simple case of swapping things over. Or so I thought So I bought the Nest thermostat and heat link 3rd generation. Although I have a oil boiler it runs off a Honeywell programmer ST6400c, along with a room...

Hi Think i have the same problem as a few others previously. The C/H is fine as soon as i turn the hot water on it cuts out. If i try just the hot water it does not fire up. Sometimes with the C/H on and if i turn the hot water on it will keep on cutting in and out. I have read some previous...