Heating Wiring Problem - cylinder thermostat not working

[diditrain]

I take it, your pump is inside your boiler? Ideally you need someone who knows how to test properly/safety. After demand for heating and hot water has ceased, you need to ensure that there is no voltage on Live return conductor at the boiler. Also them boilers have a link inside them that needs removing when external controls are fitted as it gives the boiler a constant demand. If the link has been left in place and your valves are shut, this may be the problem. Maybe.

 

[dfreitag]

I take it, your pump is inside your boiler? Ideally you need someone who knows how to test properly/safety. After demand for heating and hot water has ceased, you need to ensure that there is no voltage on Live return conductor at the boiler. Also them boilers have a link inside them that needs removing when external controls are fitted as it gives the boiler a constant demand. If the link has been left in place and your valves are shut, this may be the problem. Maybe.

Hi diditrain

Thanks for your input!Sounds like this could be the case..
And yes, the pump is built into the boiler.
At the moment, when on, the heating LED is blinking and the pump is constantly on (I make sure to switch off the boiler after I don't need it).

I'd love to get someone competent in to solve this all asap, but as mentioned above, I've recently had some costly and unsuccessful experience with plumbers.. and I don't quote know who to turn to for this anymore.. Even the highest rated plumber on checkatrade, who came at a price, didn't pick up something as basic as the cylstat not working..

Any advice on who to contact?? I'm in Hackney, East London..

In the meantime, I feel at this point the best thing to do is to get your valuable help and perhaps pass that information on to whoever I will be able to get in, in the hope it will help him actually solve this saga of an issue..

On that note, would you mind sharing where is that boiler link you mentioned, and what's it called officially?


Many thanks!

 

[Aaron b]

It would likely be in RT terminal and jumping from the line conductor where the power connects to the boiler (X1 on the PCB). The manual for your boiler isn't particularly clear.

 

[diditrain]

Hi diditrain

Thanks for your input!Sounds like this could be the case..
And yes, the pump is built into the boiler.
At the moment, when on, the heating LED is blinking and the pump is constantly on (I make sure to switch off the boiler after I don't need it).

I'd love to get someone competent in to solve this all asap, but as mentioned above, I've recently had some costly and unsuccessful experience with plumbers.. and I don't quote know who to turn to for this anymore.. Even the highest rated plumber on checkatrade, who came at a price, didn't pick up something as basic as the cylstat not working..

Any advice on who to contact?? I'm in Hackney, East London..

In the meantime, I feel at this point the best thing to do is to get your valuable help and perhaps pass that information on to whoever I will be able to get in, in the hope it will help him actually solve this saga of an issue..

On that note, would you mind sharing where is that boiler link you mentioned, and what's it called officially?


Many thanks!

You want a competent Electrician to check the electrical side of things

 

[diditrain]

Hi diditrain

Thanks for your input!Sounds like this could be the case..
And yes, the pump is built into the boiler.
At the moment, when on, the heating LED is blinking and the pump is constantly on (I make sure to switch off the boiler after I don't need it).

I'd love to get someone competent in to solve this all asap, but as mentioned above, I've recently had some costly and unsuccessful experience with plumbers.. and I don't quote know who to turn to for this anymore.. Even the highest rated plumber on checkatrade, who came at a price, didn't pick up something as basic as the cylstat not working..

Any advice on who to contact?? I'm in Hackney, East London..

In the meantime, I feel at this point the best thing to do is to get your valuable help and perhaps pass that information on to whoever I will be able to get in, in the hope it will help him actually solve this saga of an issue..

On that note, would you mind sharing where is that boiler link you mentioned, and what's it called officially?


Many thanks!

Do you have any photos of how it is connected inside the boiler?

 

[dfreitag]

You want a competent Electrician to check the electrical side of things

I actually also had a sparky over, too..
a recommended one from my builder..
he told me to change a perfectly working motorised valve..

 

[dfreitag]

Do you have any photos of how it is connected inside the boiler?

Of course. And happy to take more if needed - just let me know..

I can see a dangling black cable again.. and nothing on 3 or 5.. and no bridge anywhere..?

See below!

 

[dfreitag]

It would likely be in RT terminal and jumping from the line conductor where the power connects to the boiler (X1 on the PCB). The manual for your boiler isn't particularly clear.

Sorry, but I'm having trouble finding X1

Also, please see actual connection photo in my previous post above - from my layman point of view the connection to the RT seems incomplete..?

See below PCB taken from the manual

ALSO see below diagram as shown in manual for System Boiler - there is a bridge b/w 3 and 4... which mine doesn't currently have..

 

[Aaron b]

Do you have a photo of the label? The manual looks different to the photos. Has the system ever worked? There's a lot of flux on the PCB I assume it has been repaired.

 

[dfreitag]

Do you have a photo of the label? The manual looks different to the photos. Has the system ever worked? There's a lot of flux on the PCB I assume it has been repaired.

sure - do you mean the boiler label (below)?

I WAS TOLD THIS PCB IS NEW!! I paid £250 for it... did the guy rip me off bringing me a used one??

 

[dfreitag]

By the way this is the manual I found online..

https://www.vaillant.co.uk/downloads/z/ecotec/ecotec-installation-servicing-2-2005-261445.pdf

 

[dfreitag]

And sorry, I forgot to reply.

It was working just fine until I decided to have a Nest Thermostat installed, and it was downhill from there..

It seemed to be working fine for a while, but maybe I just didn't notice the boiler running & overheating constantly at first..

 

[Aaron b]

sure - do you mean the boiler label (below)?

I WAS TOLD THIS PCB IS NEW!! I paid £250 for it... did the guy rip me off bringing me a used one??

View attachment 100150

I just loaded a manual from Google instead of their website and it looks more like yours. It appears that it doesn't accept any switched live but expects a switched signal between 3 and 4. The orange and grey cores are the switched ones from the valves and could be used for that.

Do you have a meter to test that there is 230v on terminal 4?

 

[dfreitag]

I just loaded a manual from Google instead of their website and it looks more like yours. It appears that it doesn't accept any switched live but expects a switched signal between 3 and 4. The orange and grey cores are the switched ones from the valves and could be used for that.

Do you have a meter to test that there is 230v on terminal 4?

Ok, I see..

I don't have a meter at the moment, but can go buy one if it will help!

 

[dfreitag]

one like this?

Digital Multimeter Car Battery Circuit Multi Tester Voltmeter Ammeter OHM AC/DC Voltage DC Current Continuity Resistance Diodes Transistor Electrical Test Meter with Test Leads Backlight LCD : Amazon.co.uk: DIY & Tools

Free delivery and returns on all eligible orders. Shop Digital Multimeter Car Battery Circuit Multi Tester Voltmeter Ammeter OHM AC/DC Voltage DC Current Continuity Resistance Diodes Transistor Electrical Test Meter with Test Leads Backlight LCD.

www.amazon.co.uk