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- 26 Oct 2022
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Hi all,
I have just completed a rewire in my house and as part of that I moved the wiring for the boiler and nest heat link into/next to the wiring centre in the airing cupboard upstairs.
Originally a I did a swap from drayton lp522 to nest, as part of that I redid the wiring centre with the heat link downstairs and everything was working fine and as expected. So everything has been working before!
After the rewire, everything now runs from the wiring centre upstairs, the heat link is wired in directly and I ran new 5 core cable to the boiler which is also now wired into the wiring centre. I believe these were the only changes made, but I must be missing something
The issue now is that when the thermostat calls for heat it turns on but never turns off. Hot water is fine. If i restart the system (turn off at spur, powering down everything), and no call for heat is made (e.g. thermostat is set to away), the boiler remains off. If the heating is still firing, even when thermostat is not calling for it and I turn the power off on the boiler (front switch) and back on again, boiler fires up again.
Some wiring info:
Wiring centre is powered from a spur, which powers everything except the tank heating element.
Boiler 5 core is wired into the back of the wiring centre, Red and white being pump and switched live (8)
Forgive the tacked on earth, that was an addition today, as I realised that when powering thermo from the heatlink earth is required. Also I appreciate that heatlink 4 needs to be sheathed and will be when Iv figured out whats going wrong!
When the thermostat is set to a low heat after CH has been running,
Voltage reads 240v between neutral and terminal 8 of the wiring centre
I still get 240v on terminal 3 of the heat link, I hear clicks form the relays in the heat link both on call for heat and when I turn down the thermostat
(if i then pull out the cable out of heat link terminal three heating stays on).
Im sure this is a wiring issue, maybe its something simple that someone can see that I cannot!
I have just completed a rewire in my house and as part of that I moved the wiring for the boiler and nest heat link into/next to the wiring centre in the airing cupboard upstairs.
Originally a I did a swap from drayton lp522 to nest, as part of that I redid the wiring centre with the heat link downstairs and everything was working fine and as expected. So everything has been working before!
After the rewire, everything now runs from the wiring centre upstairs, the heat link is wired in directly and I ran new 5 core cable to the boiler which is also now wired into the wiring centre. I believe these were the only changes made, but I must be missing something
The issue now is that when the thermostat calls for heat it turns on but never turns off. Hot water is fine. If i restart the system (turn off at spur, powering down everything), and no call for heat is made (e.g. thermostat is set to away), the boiler remains off. If the heating is still firing, even when thermostat is not calling for it and I turn the power off on the boiler (front switch) and back on again, boiler fires up again.
Some wiring info:
Wiring centre is powered from a spur, which powers everything except the tank heating element.
Boiler 5 core is wired into the back of the wiring centre, Red and white being pump and switched live (8)
Forgive the tacked on earth, that was an addition today, as I realised that when powering thermo from the heatlink earth is required. Also I appreciate that heatlink 4 needs to be sheathed and will be when Iv figured out whats going wrong!
When the thermostat is set to a low heat after CH has been running,
Voltage reads 240v between neutral and terminal 8 of the wiring centre
I still get 240v on terminal 3 of the heat link, I hear clicks form the relays in the heat link both on call for heat and when I turn down the thermostat
(if i then pull out the cable out of heat link terminal three heating stays on).
Im sure this is a wiring issue, maybe its something simple that someone can see that I cannot!