honeywell zone valve help

[LPATT]

I've got a gravity fed central heating system with a honeywell mortorised zone valve V4043H1106 which needs replacing.
(I also have a Netamo smart thermostat, just in case that makes a difference) I've bought a replacement head the code is 272848 but this is missing the white wire.
can this be fitted or do i need the version with the white wire. Plumbers merchant has said this is fine to use?

 

[stem]

The white wire provides a signal from the microswitch inside the motorised valve that becomes live when the valve closes.

This wire is provided for use with systems that are configured as a C-Plan and have gravity circulation of the Hot Water and only pumped Central Heating. It allows the HW to call for heat without causing the pump to run if CH isn't needed.

So, if you have a C-Plan, then the answer is no, as it performs a required function. If you have an alternative system, then it likely will be OK without.

 

[oldbuffer]

1. The version with the white wire is the 28mm version. I think the new one you have is a 22mm type. If so you will need some pipework modifications.
2. Is the white wire on the old one joined to any other wire in the wiring centre, or is it just isolated and unconnected? If the latter you should be able to use the new one subject to any pipework changes.
3. The 28mm version has a bigger "throat" when open, which can help circulation on large systems.

 

[LPATT]

thank you for everyones help ..

1. The version with the white wire is the 28mm version. I think the new one you have is a 22mm type. If so you will need some pipework modifications.
2. Is the white wire on the old one joined to any other wire in the wiring centre, or is it just isolated and unconnected? If the latter you should be able to use the new one subject to any pipework changes.
3. The 28mm version has a bigger "throat" when open, which can help circulation on large systems.

the white wire is connected to the wiring centre but no other wires with it. The problem is I don't know what type of system it is - boiler, hot water cylinder in airing cupboard, water tank in the loft, one zone valve, honeywell controller thats used just for the hot water, and netamo that controls the heating. The hot water comes on okay with the programmer but the heating doesnt with the netamo or even if i set the programmer to constant.
I was just replacing the motor head, i took the code into the plumber merchant told him it was 28mm, he sold me the whole part said i can just take the motor off and replace, looking at what i've bought it says on it hot water only. I've even called them and he's said that all they sell nowadays, which i know is utter B! but researching this, I'm getting mixed messages, even heating controlls online that sell this has the correct code 1106 and in brackets sometime coded 272887 which is what I have! I'm just trying to get some heat on.
attached a pic, you can see hte white wire at the bottom right

 

[Agile]

You could have bought a replacement valve head.

Or if the motor was failed just a motor!

 

[LPATT]

thank you for answering and yes i have bought the valve head, the guy who sold it to me said it was cheaper to buy the whole thing. I have already taken the pipe work off the so it can just be replaced easily. I just want to know if i can use this valve head on my system, which I think i've worked out is a S system, as there are 2 flow valves one up near the hot water cylinder that tbh i didn't realise was there and defo no pump. my boiler is approx 15 years old.

You could have bought a replacement valve head.

Or if the motor was failed just a motor!

 

[LPATT]

thank you for everyones help ..

the white wire is connected to the wiring centre but no other wires with it. The problem is I don't know what type of system it is - boiler, hot water cylinder in airing cupboard, water tank in the loft, one zone valve, honeywell controller thats used just for the hot water, and netamo that controls the heating. The hot water comes on okay with the programmer but the heating doesnt with the netamo or even if i set the programmer to constant.
I was just replacing the motor head, i took the code into the plumber merchant told him it was 28mm, he sold me the whole part said i can just take the motor off and replace, looking at what i've bought it says on it hot water only. I've even called them and he's said that all they sell nowadays, which i know is utter B! but researching this, I'm getting mixed messages, even heating controlls online that sell this has the correct code 1106 and in brackets sometime coded 272887 which is what I have! I'm just trying to get some heat on.
attached a pic, you can see hte white wire at the bottom right

just to add - also a valve up next to the hot water tank (different part code) and a thermostat on the hot water tank.

 

[stem]

If there is only one motorised valve fitted to the system, then it does sound like a C-Plan and your description of how it isn't working would correspond to a C-Plan with out the white wire connected. [It's what controls the boiler when the Central Heating is required but the Hot Water isn't] Also as @oldbuffer a C-Plan motorised valve is usually 28mm. Is yours?

Your post is somewhat contradictive though.

one zone valve,

just to add - also a valve up next to the hot water tank (different part code) and a thermostat on the hot water tank.

If it is a C-Plan and my theory is correct that would mean it would never have worked properly. Is that the case? If it has worked correctly in the past, then stopped, has anything happened / been changed between it working and not working?

If there are 2 motorised valves then it won't be a C-Plan. However I only see one motorised valve cable at the wiring centre.

Unfortunately I've never seen, or heard of a Netamo thermostat. But at the end of day Central Heating thermostats for older boilers without the newer control facilities such as Opentherm will be just a simple on/off switch anyway, as per the C-Plan diagram.

 

[LPATT]

Sorry yes my post is probably confusing, the pic is not of full wiring centre, just a close up of the white wire that comes from the valve near the boiler that is faulty. I've attached some more pics.

I'd not realised there is a 2nd valve upstairs by the hot water cylinder, as I've not had to look in detail at our heating system before. One youtube video later and all is clear, it's not a C plan it's an S plan.

The netamo is the same as a nest or hive - just a different brand. https://www.netatmo.com/en-gb

Still not sure if the white wire shown in the pic is wired up to anything/doing anything - which is what this question is about really.
Thank you all for responding and any help on the white wire (see pic posted) and whether I can use the valve head bought without the white wire would be appreciated...its getting colder by the day

If there is only one motorised valve fitted to the system, then it does sound like a C-Plan and your description of how it isn't working would correspond to a C-Plan with out the white wire connected. [It's what controls the boiler when the Central Heating is required but the Hot Water isn't] Also as @oldbuffer a C-Plan motorised valve is usually 28mm. Is yours?

Your post is somewhat contradictive though.





If it is a C-Plan and my theory is correct that would mean it would never have worked properly. Is that the case? If it has worked correctly in the past, then stopped, has anything happened / been changed between it working and not working?

If there are 2 motorised valves then it won't be a C-Plan. However I only see one motorised valve cable at the wiring centre.

Unfortunately I've never seen, or heard of a Netamo thermostat. But at the end of day Central Heating thermostats for older boilers without the newer control facilities such as Opentherm will be just a simple on/off switch anyway, as per the C-Plan diagram.

 

[stem]

If you have a S-Plan with separate motorised valves for the HW and CH then the white wire is not required. Which is confirmed by it not being connected to anything at the wiring centre.