Compatibility checker

[SaintMaxwell]

Please can someone help. 

I was told to upload a photo.  the grey and yellow/green wires aren't use

[CoolingWizard]

Saint a well,

this thermostat is designed to operate with low voltage and high voltage equipment.  It can control a Boiler, a Combi Boiler, a Zone Controller, zone controller Pump, and an electric actuator. It looks like your is set up to control a boiler.  Your thermostat does not have a COMMON wire and you need to determine if the Red wire in A 

position is high voltage or low voltage.  Do you have a Volt Ohm Meter?

Ken, The AC Cooling Wizard

[SaintMaxwell]

Hello CoolingWizard,

I did a further investigation and found the supply is 230V.

My system is designed to control two zone valves. I have a single combi boiler and two thermostat and two zone valves with a central connection box. The two thermostat are connected to this central box and from this central box, it is connected to two zone valves.  The Opentherm on the boiler has a jumper cable across.

[CoolingWizard]

Only low voltage (~24VAC) systems are compatible with Nest Learning Thermostats.  

[EdwardT]

Hi folks,

@CoolingWizard, thanks for the help!

@SaintMaxwell, thnaks for reaching out. I hope that CoolingWizard's response helped you. Let us know if you have other questions and we'd be glad to assist you.

Thanks,

Edward

[EdwardT]

Hi SaintMaxwell, 

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 
 

Thanks,

Edward

[EdwardT]

Hi SaintMaxwell, 

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

[SaintMaxwell · Accepted solution]

Thanks