Vailliant boiler, Nest not turning off heating (Ed.)

[Dan76]

My Vailliant boiler (EcoTEC plus 937) which has a nest thermostat attached id not turning off the central heating!? We have turned off the Nest thermostat but the boiler continues to heat the radiators?

 

[CBW]

Could be a failing nest heatlink. Do you have a Vaillant timeclock?

 

[Dan76]

No we don’t have a timeclock. Do you know how we could check the heat link?

 

[CBW]

Do you know how we could check the heat link?

Yes, with a multimeter or 2 pole voltage indicator

 

[noseall]

My Vailliant boiler (EcoTEC plus 937) which has a nest thermostat attached id not turning off the central heating!? We have turned off the Nest thermostat but the boiler continues to heat the radiators?

Have you checked the 'predictive heating' protocol? Ours was set in the (default) on position. It would come on at all hours.

 

[Ihavenojob]

Is there a call for heat at the boiler? Diverter valve could be passing and as this is a storage combi, when it's trying to top up the tank it is just heating the radiators.