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Just spoken to my plumber. He said it’s not right and it sounds like the Thermister sensor is faulty.

I’m currently at work but been doing research. I have a dial on the front of the boiler behind the little cover. This is set really low. I wonder if this is to do with it keep cutting out. Maybe if I turn the dial it might help. I’ll post a picture of what I’m on about.

It only happens when the heating is on and it’s trying to heat up or when it’s heating water. I’ll have a look later for the frost thermostat

I’ve now connected it all back up using the rooms stat and the ST9400 and the problem is still happening. Maybe it’s been happening before and I just haven’t been listing for it. So maybe it indicates there’s a problem with the boiler?

It’s all not installed but since I’ve installed it. The boiler comes on fires up for about 1 minuet 30 goes of for about a minuet and then comes back on. It just repeats that cycle. Any idea?

Perfect thank you so much. I have now purchased nest and will be giving it a shot later this afternoon. given myself plenty of headaches making sure the wiring is spot on. But then you popped up and mad it sound 100x easier. I will keep you posted with the outcome. If I'm successful I will look...

I think I’ll stick to putting the heat link where the ST9400 is sounds a lot easier. I’ll put the nest on a stand and leave the old in place but just disconnect it at the wire centre. Makes things a lot easier when I move home to put it back.

Perfect thank you much for your reply, that has made things muscle clearer. I’ve been researching for days and couldn’t find out where the link goes in the wiring centre when I remove the stat. So you would advise to not use the current wires at the stat to power the nest. I’ve also gone down...

I currently have a Honeywell st9400A on my Y plan system with a Honeywell room stat. I’d like to know what wires go where from my existing controller to the nest heat link. Also what would I have to do to the existing room stat. I was looking at installing the link next to the water tank so...