Upstairs system will not work unless downstairs system is working

[Stickymint]

As it says in the subject my upstairs heating will not work unless the downstairs in heating up.

The upstairs is set to come on 1 hour before the downstairs, however, the upstairs will not start heating up until the downstairs starts heating up..

Also if i try override the upstairs during the day when no heating is on at all, it doesn't.  What is frustrating in that the up stairs thermostat in these instances is showing orange as if it is providing heat - but it isn't.

What is wrong?

[Markjosephp]

Hello Stickymint,

I'm sorry for the late reply and for the trouble this may have caused you — let's see what's going on. 
 

To isolate:

• What type of Nest Thermostats do you have?
• Do you have a zoning system?
• What type of furnace do you have? (gas, electric, etc.)
• Did the heating ever work with the upstairs thermostat?
• Did you select the correct fuel type?
• Do they have a C wire?
• Please check the power status for battery level, voc, vin, and lin under technical info settings.

I'll look forward to your response.

Best regards,

Mark

[Jeran]

Thank you for helping out on this thread, Mark!

Hey there Stickymint,

I'm just checking up on this thread, do you have any more questions or need any additional help? 

Best regards,
Jeran
 

[Stickymint]

Hi Jeran & Mark

 What type of Nest Thermostats do you have?

2 x Nest learning thermostats

 Do you have a zoning system?

Yes, downstairs and upstairs

 What type of furnace do you have? (gas, electric, etc.)

Gas - Worcester Bosch Greenstar CDi Classic regular, condensing boiler

 Did the heating ever work with the upstairs thermostat?

It only works when the downstairs is providing heat

 Did you select the correct fuel type?

How do I check this

 Do they have a C wire? 

Don't know what you mean

Please check the power status for battery level, voc, vin, and lin under technical info settings. 

                  Downstairs        Upstairs

Battery level            3.934v            3.950v

Vusb                     0.03v           5.01v

Vin                     10.97v                         0.00v                        

lin                         200mA           200mA

Let me know what you think is wrong.

Mick