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As I said it's rather pointless for most people to do that. But for me this is good news especially since I do not use a Vaillant controller. Now my self built controller has access to the boiler read external temperature reading too, and the temperature of the cylinder too without needing any...

I wasn't sure if the logic to convert resistance to temperature was built into the boiler or the controller. Turns out, it's the boiler that actually informs all the devices on the bus as to what the external temperature is. They in turn use that information to perform any weather compensation...

Using the wiring harness above you can connect the NTC VR10 of the cylinder directly to the boiler even while using wiring centres like VR65 or VR66. Just thought I'll mention this as this provides an alternative to wiring the cylinder sensor only back to wiring centre as per the instructions...

Just for information, you can connect an external temperature sensor to the boiler directly and read the external temperature on the boiler directly without using any of the Vaillant controls. It's rather pointless to do so, because you won't use an of the weather compensation features without a...

The part number for that harness is 0020247021.

That is it. Glad it is available as a spare. Vaillant were kind enough to send me a spare while I was still hunting down the part. For future reference the part number is 252629 6-pin Plug connector X6

Fair enough. But that plug doesn't even seem to be on the wiring harness because it's an optional plug. it's not needed for boiler operation. Can't understand why Vaillant would refer to a plug in the VR61 instructions that isn't on the boiler as standard and isn't included with the VR61. Maybe...

Now how hard would that be to have said before. The only reason I thought it might be a spare is because the VR61 makes references to using it but the plug is not included with it.

You probably won't believe me. But the cover is exactly where the Gas Engineer left it, screwed securely on the boiler. I cannot understand why everyone on here assumes we are foolish enough to be playing with this while we ask legit questions. What's the point of the unhelpful answers? I am...

Also the VR61 instructions talk about installing thermistor to this PCB edge connector but doesnt include one in the box and nor does the boiler PCB itself come with it. Hence I wondered if this PCB edge connector was available as a spare or not?

I realise this thread is really old but is there a part number for that ecoTEC open vent, cylinder NTC harness? I note that if installing a VR65/VR66 the VR10 for the cylinder is installed in the wiring box itself but when using the VR61 the same VR10 for the cylinder is wired directly to the...

Vaillant include this 6 pin plug with their VRC430 to connect the external weather sensor VRC693 to the edge of the boiler PCB. Red plug. I didn't think it was a generic plug because it has some marking on the plug...

Does anyone know the part number for the PCB edge connector on a Vaillant boiler that slots into the PCB edge at position X41? Or where I can buy a spare?

That was my usual source. But I was wondering, surely there must be places that recycle appliance parts and don't list on eBay. Or do most of this land up in landfill? I know my old boiler probably landed up at some metal recycling place but what about the other stuff that gas engineers pull out...

Just wondering if there was an equivalent of car breakers in boilerland? I'm after a Vaillant control centre either VR65 or VR66. But it's not being used for the purposes they were designed for and hence I don't want to pay full price for them. I'm using them for a project. I don't mind however...

OK, so some software has changed. Even the part number of the PCB as seen by the boiler has changed. Looking via diagnostics the old PCB had a part number of 00 20 02 29 30 and software versions 0402a70802 and 0403ae0512 Looking via diagnostics the new PCB has a part number of 00 20 03 68 61...

New PCB has was sent to me has "0020092504 (On a sticker) Then screen printed onto the PCB is: TM-K2 V132_K2 0020080512". Technical department has said the part no for the replacement PCB is still 0020036861.

Just to let people know that I wrote to Vaillant to tell them about my boiler and the S.53 that I get on start up sometimes. My boiler was installed in 2010 and they admitted that my PCB may have a fault with it. Later versions were produced with newer software to fix this. Vaillant are sending...

Yup I learnt the hard way, that the Auto Adapt in my Alpha2 was useless. Now it's set to III all the time. Wasted money on that pump, quite frankly. But it is SO much quieter than the previous normal Grundfos it replaced. When I bought it, I should have bought a 25-80 then :mad: instead I...

And that brings me to the ABV. Yes my installer didn't set the ABV and he just said, leave it at 3! It's a pity these boilers don't seem to have a flow rate reading, it would have been so handy when setting the ABV. I've seen some pumps that have it. They provide a minimum flow rate through the...