Nest 3rd Gen Thermostat and Biasi Riva Combi

[Rise Park John]

Hi All,

I've just moved house and found that the above boiler had no external controls so yesterday I installed a Nest thermostat. I'm a qualified electrician and the install was really straight forward. My boiler has A and B connections with a programmer symbol rather than the 1 and 3 terminals I've seen on line.

My problem is that despite looking fabulous, the Nest thermostat doesn't appear to controlling room temperature, at least that's what the apps telling me. Its switched to Eco mode which should give around 10 degrees but the stat is registering 19 degrees.

I've got a heating engineer on the way to service the boiler, but anything obvious in the meantime?

Cheers,

John.

 

[Gasmk1]

it registers the house temp.

 

[Dogby]

If you turn the temp up does the boiler fire up?
It has 2 displays, 1) the room temp , 2) the desired temp. If you touch/adjust the temp via the nest it should flick between the information

 

[Rise Park John]

I understand what you mean, but I with the room stat set to 10 degrees the room temp has stayed at 19+ degrees for several hours. I'm assuming that the boiler is over riding the Nest/

I've just read a post about removing / disconnecting the boiler programmer all together to allow the Nest to manage programming / temperature. Wondering if this would help.

 

[Dogby]

The nest should take over all programming so set current timer to continuous and the nest should do the rest. Is it a plug in analogue timer or an external programmer?

 

[Rise Park John]

Its an integral digital module.

 

[Dogby]

As a sparks you will be able to remove the digital clock or bypass it so the heating works purely off the nest unit

 

[Rise Park John]

Nice one, I'll give it a go.

 

[Gasmk1]

are the radiators on though it can only turn on th eheating it cant cool it down so if the house is a mid terrace it may well be 19 degrees in the house.

 

[Rise Park John]

True, I might be worrying about nothing.

I'll try disabling the integral programmer tonight and see what happens.