Heat link question desperatel

[bjstanbridge]

Good morning
Our heatlink is not working. It is going to be replaced free of charge but its lost in the FedEx Express system.

There is power to it.

We are desperate for some heat in the house as we have a two month old baby and a 3 year old.

I have read on this forum that I can swap some cables over in the heat link to fire up the boiler.

We don't need hot water as we can use the immersion on the hot water tank.

Please can anyone let me know which connections to change.

Thank you.

 

[RandomGrinch]

You can try moving the black wire in terminal 3 to terminal 1 for heating and the green/yellow wire from terminal 6 to terminal 4 for H/W

And then use the controls on your boiler to set timings.

if that doesn't work (we don't know how decent the relay contacts are), move the brown wire in terminal 2, to terminal 3, for heating.

 

[bjstanbridge]

Thank you I shall have a go

 

[RandomGrinch]

Thank you I shall have a go

Sorry, just edited my post.
Hopefully the edit will allow easier switching of heating and H/W if you need it!
Good luck

 

[Madrab]

please shut the power off to your system first and make sure the heat link switches off before playing with any wires as there's 240v running through that!! If you have a circuit tester make sure the connection is dead.

 

[bjstanbridge]

Thank you

 

[RandomGrinch]

please shut the power off to your system first and make sure the heat link switches off before playing with any wires as there's 240v running through that!! If you have a circuit tester make sure the connection is dead.

Apologies to the OP for a slight digression, and I'm not disagreeing with @Madrab, as I have often thought about this and am genuinely interested in the answer.
When should we warn about the dangers of live wiring?

It is rarely done on the Electrics forum and it would be tiresome to write a disclaimer to the hundreds of requests for help we get to wire up Hives!

Is this instance different, because there is an assumption that someone who is going to change the wiring to a Hive would definitely know that the supply should be isolated. Whereas here, the OP just wished to switch the heating on?

@bjstanbridge , may I ask if you would have checked that the supply was isolated before taking the cover off of the Heat link and swapping wires?

I hope you and the kids are warmer now

 

[bjstanbridge]

Thank you guys, for all your help and advice.
Yes, I did isolate the supply before looking.
The children are now getting warmer.
We have an old house and the temperature had dropped to 9 degrees. I managed to send them out this morning.
This has also brought the nest thermostat back on. This means i can use this as the on off switch to the boiler

Once again a massive thank you.

 

[RandomGrinch]

This has also brought the nest thermostat back on. This means i can use this as the on off switch to the boiler

If you've moved the wire as suggested, I'm afraid the thermostat won't turn the boiler on and off, as we've basically bypassed the control.
But some Heat links are known for being temperamental and Google seem to be good at replacing them.

Yes, I did isolate the supply before looking

Thanks for the confirmation

 

[Madrab]

When should we warn about the dangers of live wiring?

That's a fair question. All I can add is that as with anything, the first thing we learn as part of the trade quals, is safe isolation and the first thing I would drum into the trainees. Therefore it's is foremost in mind as the first thing that gets done. As this is a DIY forum then I would hate for a DIY'er to come on and say, jeesh, that wire gave me quite a jolt, didn't realise it could be a live wire, especially when certain controls for boilers can be zero volt.

I would always want to err on the side of caution and warm someone that is on asking what could be considered a pretty straightforward DIY questions (just check the manual), what wire should be changed if 240V were involved.