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With nest controller you can to set both hot water and heating the default only commands hot twice per for about 1 hour. Which whilstv enough maintain yemp won't heavy use e.g shower bath. The nest thermostat pairs via wifi mesh to its heat unit slave. Which has a simple soc driven set of solid...

No with HW and Thermo on max pump starts with preheat boiler function. After preheat tomer expuies pump stops boiler doesn't fire. Nest in manual puts both hw an ch and both a and b outlets get hot. Then only hot. Then boiler stops run till run timer expires. Pump runihg hw gets hotter, outlet A...

The wife chip failed so nest controller needed replacing. Have with and without hot water for hest and see same behavior. If acwiring diag fir (obsolete) L641A1005?

The nest and boiler were professionally installed. So I would the followed y plan when wiring when installing it. To heating only - boiler fires. Heating plus hot water demand. Get both hw and ch. Hw demand only - pump starts then stops when doesn't start. But valve doesn't appear to move. Tho...

Tecently noticed that the hot water is only working if there heating snd hot water demand. Valve is position A for heating and is ooening hot water position B. With both heating and hot water flow goes into both sides. The system is y plan. I fsrly new to the house and had new boiler with google...