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ESRTERFW Wireless Thermostat wiring help

Discuss ESRTERFW Wireless Thermostat wiring help in the Central Heating Systems area at ElectriciansForums.net

edgealex

edgealex

DIY
Joined
Nov 17, 2023
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Location
Manchester
Hello,

I'm trying to upgrade my mechanical thermostat to a wireless one but when I connect the wires it doesn't work.

This is the old one:
[ElectriciansForums.net] ESRTERFW Wireless Thermostat wiring help[ElectriciansForums.net] ESRTERFW Wireless Thermostat wiring help

And this is the new one:
[ElectriciansForums.net] ESRTERFW Wireless Thermostat wiring help[ElectriciansForums.net] ESRTERFW Wireless Thermostat wiring help

I tried to connect the brown wire to pin (1) and blue to pin (2) but it didn work, anyone can help?
 

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It looks like your old thermostat is just wired with a L & Calling for Heat, i.e. no N connection.
Your new thermostat appears to need a N connection that you don't have.
 
Thanks for the response. If I wanna change my old thermostat, do you know what kind of thermostat should i look for to fit the current wiring? I appreciate it if you could mention names or links
 
You need a battery powered thermostat.
The ESI one seems to have a remote sensor. If you need that then that would limit your choice.
 
I'm puzzled by what you are trying to do here. The product you show is a wireless thermostat in the sense that the temperature sensing bit is battery powered, and it sends data to the mains powered bit that you mount by the boiler, which receives the signal and turns the boiler on and off etc. It's designed to be used when you don't have a wire going to where you want a thermostat.
But you do have that wire.

Did you want "wireless" in the sense that you want to use the thermostat from your phone?
If so, the solution is a battery powered 'smart' thermostat.

One example of this (from China!)

or if you just want a better looking digital thermostat with programmer, but not operated remotely:
www.thefloorheatingwarehouse.co.uk

Heatmiser Slimline-B V3 Battery Powered Programmable Thermostat | The Floor Heating Warehouse

A Battery Powered Digital Programmable Room Thermostat for controlling either individual or multiple zones of your floor heating system Our Slimline-B V3 battery thermostat offers a viable upgrade route for those with a dial thermostat working on a two wire system. Click Here For: Slimline-B...
www.thefloorheatingwarehouse.co.uk www.thefloorheatingwarehouse.co.uk
 
As an Amazon Associate Electricians Forums may earn a small commission from qualifying purchases.
Avo Mk8 said:
I'm puzzled by what you are trying to do here. The product you show is a wireless thermostat in the sense that the temperature sensing bit is battery powered, and it sends data to the mains powered bit that you mount by the boiler, which receives the signal and turns the boiler on and off etc. It's designed to be used when you don't have a wire going to where you want a thermostat.
But you do have that wire.

Did you want "wireless" in the sense that you want to use the thermostat from your phone?
If so, the solution is a battery powered 'smart' thermostat.

One example of this (from China!)

or if you just want a better looking digital thermostat with programmer, but not operated remotely:
www.thefloorheatingwarehouse.co.uk

Heatmiser Slimline-B V3 Battery Powered Programmable Thermostat | The Floor Heating Warehouse

A Battery Powered Digital Programmable Room Thermostat for controlling either individual or multiple zones of your floor heating system Our Slimline-B V3 battery thermostat offers a viable upgrade route for those with a dial thermostat working on a two wire system. Click Here For: Slimline-B...
www.thefloorheatingwarehouse.co.uk www.thefloorheatingwarehouse.co.uk
Click to expand...
Hello, i bought the thermostat you mentioned above (the one from china)
this has three pins(NC, COM, NO), but mine still has only two pins, how should i do the wiring?
 

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Last edited:
As an Amazon Associate Electricians Forums may earn a small commission from qualifying purchases.
Your two wires need to go to the C (Com) and the NO (Normally Open) terminals. It doesn't matter which way round they go.
It doesn't need an earth, so just leave that wire with the sleeving on and not connected
 

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