C/H turns off

[D_Hailsham]

Right I just checked the wires on the tiara and there is a wire connected to the 3rd terminal

I'm sorry but there is no wire connected to terminal 3. You may be confused by the terminal numbers which are, from left to right: E, N, L, 1, 2, 3, 4, 5, 6.

E, N and L are correct, and also the link from L to 2 and 2 to 5.

Terminal 1 is HW ON (brown wire)
Terminal 3 is HW OFF and should be connected to the same terminal as the grey wire from the Drayton motorized valve
Terminal 4 is CH ON (uses the green yellow "earth wire", which is not recommended as it could cause confusion).

Connect a wire from Tiara terminal 3 (no 6, counting from the left) to the valve grey wire (in the Honeywell Junction box) and your problem should be solved. There should be three wires, including grey, connected to the same terminal.

What is the terminal strip for which is lying on top of the junction box?

The meter you show would do the trick.

 

[gman2050uk]

Hi D_Hailsham, tried what you said, there's a couple of pictures below to show what I did.

I connected a piece of brown wire from the Honeywell block, where the grey wire is connected to terminal 3. But it is still being controlled by the hot water temperature? Have I miss something out, as the wiring doesn't look that good? Any ideas gratefully received

 

[gman2050uk]

Just to help you identify, the green and yellow wire connected to terminal 4 is also connected to the grey wire in the Honeywell block.

 

[D_Hailsham]

Just to help you identify, the green and yellow wire connected to terminal 4 is also connected to the grey wire in the Honeywell block.

That's wrong!

Can you check which way round the motorized valve is?

The ports are labelled AB, A and B

AB connects to the pump;
A should connect to the radiators;
B should connect to the HW cylinder.

If this is correct, can you check what the valve white wire connects to?

 

[matt1e]

E, N and L are correct, and also the link from L to 2 and 2 to 5.

I think you might want to want to rethink this mr H have another look at the earth

who ever wired it got a bit mixed up when using green/yellow cores as phase colours

Matt

 

[D_Hailsham]

E, N and L are correct, and also the link from L to 2 and 2 to 5.

I think you might want to want to rethink this mr H have another look at the earth

who ever wired it got a bit mixed up when using green/yellow cores as phase colours

I was only looking at the programmer backplate

But I see what you mean. How anybody can make such a simple error when the cables are in full view is beyond understanding. The only explanation has to be COWBOY.

I think it might be time to disconnect everything and start again!

 

[gman2050uk]

Right, unfortunately we are victims of a DIY enthusiast!!!! He installed all electrics and plumbing for the STREET!!!!! Everybody else has had new plumbing/electrics over the years, where as unfortunately we have not. Please can someone explain what is wrong, or if the whole lot needs redoing, where do I start?

 

[D_Hailsham]

Please can someone explain what is wrong,

Probably everything!

if the whole lot needs redoing, where do I start?

At the beginning

It's probably easiest to disconnect everything from the Honeywell junction box and start again.

The correct wiring is in the diagram below (click to enlarge, right click to save). Study it and, if you have any queries, ask.

View media item 70

 

[gman2050uk]

That looks pretty clear............................... only we cannot tell which wire is from the room thermostat and which is from the boiler? Any Ideas????

 

[D_Hailsham]

we cannot tell which wire is from the room thermostat and which is from the boiler?

Have you bought the multimeter? If not get one.

Turn off the power to the heating system

Label each cable and then disconnect all wires.

Turn the thermostat down to minimum.

Set multimeter to Ohms or "Continuity".

Connect the meter to one pair of possible room stat wires. It should read open circuit. Turn the stat to max; meter should drop to zero. If this doesn't happen, try another pair of wires until you get the correct pair.

PS which boiler do you have? I may have given you the wrong diagram.

 

[matt1e]

first disconnect the single brown wire you installed...... its no good anyway as its not double insulated

then at the programmer disconnect the g/y currently connected to E and reconnect it to terminal 3

now see if your heating works, in fact I'll have a quid on it that it will

Matt

 

[matt1e]

then if it does, do yourself and others a favour and install another flex between the box and the programmer so you can avoid using the earth cores as live conductors

 

[gman2050uk]

D Hailsha, it's a back boiler in the wall? Would that mean that you have given us the correct diagram?

Matt, we have already taken all the wires out Do you have a diagram of how you think it should be?

 

[D_Hailsham]

D Hailsha, it's a back boiler in the wall? Would that mean that you have given us the correct diagram?

DO you mean it is in the fireplace, with a gas fire in front? If so, the diagram I posted is correct.

If not in the fireplace, what is the make and model?

 

[gman2050uk]

Wired it all up and it was the same as before, until I turned the room thermostat on and it blew. Switched the two black wires from the room stat round and this time it did not blow but also doesn't work with out the water heating. Will take a photo in the morning, don't know what else to try?!?!?!