12-08-2023 12:57 PM
I have a Worcester Heatslave 15/19 boiler that had a thermostat already connected up which turned the heating on or off rather than setting specific temperatures.
The thermostat has the following wires connected into the circuit: Live, neutral, heating on and earth. It also had a jumper cable.
Trying to install our nest we connected the live and neutral wires appropriately and then the earth wire to the earth port and the last wire to port 3 (heating on) but didnt install the jumper cable to the common wire port due to the forums saying it isnt needed.
The heat link has all lights green and the thermostat says everything is working fine but the heating doesnt seem to be coming on at all.
Is this a case of needing the common jumper cable or is there another glaringly obvious solution that i cant see?
Answered! Go to the Recommended Answer.
12-08-2023 04:17 PM
It's possible that the missing jumper cable is preventing your Nest thermostat from properly controlling your Worcester Heatslave boiler. Here's why:
However, this setup may not work in all cases, especially with older boilers that require a dedicated common wire for communication.
Here's what you can try:
1. Install the jumper cable:
2. Verify wiring connections:
3. Contact Nest support:
Additional tips:
It's important to note that I cannot provide definitive advice without seeing the specific wiring configuration and your boiler model. However, trying the above steps, especially installing the jumper cable, should help you resolve the issue.
Remember: Always ensure your safety and consult a qualified electrician if you are unsure about any electrical connections.
12-08-2023 04:17 PM
It's possible that the missing jumper cable is preventing your Nest thermostat from properly controlling your Worcester Heatslave boiler. Here's why:
However, this setup may not work in all cases, especially with older boilers that require a dedicated common wire for communication.
Here's what you can try:
1. Install the jumper cable:
2. Verify wiring connections:
3. Contact Nest support:
Additional tips:
It's important to note that I cannot provide definitive advice without seeing the specific wiring configuration and your boiler model. However, trying the above steps, especially installing the jumper cable, should help you resolve the issue.
Remember: Always ensure your safety and consult a qualified electrician if you are unsure about any electrical connections.
12-09-2023 08:22 AM
Sounds like the jumper is needed from terminal ''2 to Live''
By having just one wire in the terminal 3, you have no supply to switch the relay. Fit the link.
12-11-2023 12:33 AM
Thank you for all the information provided @Jdonyx . I would be happy to try and assist.
Thank you for the suggestions @Raheemthesolwer and @Frustratedddd . Always appreciated.
Would you be able to take a picture of the wiring on the Heat Link side, if you are comfortable in doing so? That way I can see what has been done and see if anything stands out.
You may see mentions on the forum for different wiring. just make sure that you check posts for the EU version of the thermostat as the US one is different. It's possible that the situation is like @Frustratedddd mentioned and you need a wire from Live to terminal 2 on the Heat Link. But we should be able to get a clear picture with a picture of the current wiring.
12-11-2023 01:25 AM
Hi everyone, thanks for all the replies! Just to update on this that we added in the Jumper wire between the live and port 2 and the Nest now controls the boiler as intended so this Issue is solved! Thanks for all the help.
12-11-2023 01:53 AM
That's great to hear! Make sure to test all the functions but it seems that everything is on track now. Let us know here or reach out on any of our support channels if anything comes up. Have a great week ahead!