Wifi thermostat wiring

[marian.antoni1979]

Hi!

I need advice how to connect this new wifi thermostat to replace my analog Honeywell one. Actual wiring attached.

I have a combi boiler for heating and water. There is a timer for weekdays and hours beside the boiler which is in use along with the thermostat.

Thanks in advance!

 

[johnb2713]

Which specific model of Honeywell stat is it?

 

[Murdoch]

You might not be able to use that new one.

if there a neutral at the existing controller?

 

[johnb2713]

You might not be able to use that new one.

if there a neutral at the existing controller?

Looking at the wiring, there are 3 wires connected, many stats have a resistor used as a heater to narrow the hysteresis. IF this is the case with this one, there will be a neutral there hence why I asked for the model number to check the drawing etc.