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Is WC sensor doing its job by saving you on gas? If it is leave it as it is.

I have bought the pump on ebay, it is missing the sensor attachment. I think it does as there is pipe sensor that operates the pump on preset values for HW but wasn't sure hence the question. where can I get the pipe sensor attachment that goes with the pump?

Hi, Where can I get a temperature sensor attachment for the attached grundfos pump and what does it do? Thanks

Thanks, have you been able to save on gas? Is room stat connected with WC?

Can you please post a photo of display? Mine is a heat only (dial type boiler) and I have not been able to configure it

Is it a newer model post 2021; touchscreen?

spec sheet below for the cylinder; Mine is 160 litres.

I have installed a bi-metallic thermostat on cylinder and wired it on port 96 of the PCB. HW thermostat - 70 Boiler thermostat - 65-70 pump speed - C2 (flomasta 5m head pump) The issue is that in the morning when I start the boiler (timer) it fires at full blast but then it starts to modulate...

Apologies, may have mixed them up. It is for DHW; dedicated boiler.

Message from Viessmann Good Afternoon It is not recommended to use the probe sensor on your boiler model as it is a heat only and does not have temperature setting for the DHW, your Cylinder will most likely have its own thermostat to set the temperature at, this then provides a 240 v switch to...

Could it be? I have checked the circulation without the boiler for piping from pump to indirect's flow and return and it works fine. How could I check for blockage in boiler's HEX? It works in 'SERV' mode now.

I managed to get the flow switch out. After putting it back into boiler, when i start it in 'SERV' mode, the boiler did fire (previously it wasn't firing). My queries are now: It is only firing in 'SERV' mode - How do I get it work in normal mode for DHW only. - The thermostat for indirect to...

I am facing the same issue. Before I install the boiler, I opened the flow switch to service it but couldn't get it out completely so turn the sealing nut back on. After installing the boiler I am facing the exact symptoms. Any ideas., Can't get flow switch locally.

All valves open. The boiler has a flow switch, I'll check if it works.

I can tell you from experience; I live in a milder weather than yours (not in UK) where sun is available from 1000-1430hrs in winters; In Jan my 10.8kw Solar array generated 750kWh (I doubt it you'll get half of it with UK weather). As correctly stated above Solar gives you nothing when you need...

Update : I have installed a dedicated boiler Viessmann 100-w heat only boiler with external pump and an EV on boiler's flow. The intent was to connect it to a vented hot water cylinder. I have filled system with pressure guage showing 1.5 bar on boiler piping, the boiler turns on but it keeps...

Thank you Mottie and Rob for your help.

space heating only

I have corrected the labeling, I didn't label the cold inlet as it was obvious. I am unsure how water when expanded will go into EV. Secondly, what does the arrow on PRV signify.

Correct and I am trying to grab the concept before taking it on as a DIY.