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And I could be wrong too, but I think (because I did look into it a couple of years ago) my Viessmann system boiler will allow the (flat-out, high-temperature) DHW priority mode to be triggered using the DHW switch input, while (but not simultaneously) also allowing the CH to be controlled using...

Unless you're using a massive amount of hot water, you might not notice if you've been using the electric immersion heater to heat the water. When we were having building work done on our house a few years ago, the gas boiler was decommissioned for six months so we used the electric immersion...

The aluminium tape was there so that your metal detector worked, to stop you drilling into the pipes :rolleyes:

Or maybe it's an external magnet version whose magnet (like mine) dropped off by itself in the middle of the night? What a crash that made - I realised what it was only weeks later... the magnet is now tied on with a bit of string. Quality!

True, mine is sealed. I'd overlooked that the OP's was open vented. I hadn't realised the boilers were so different. Mine's a system boiler, not a combi, but the rubber pipes are those in the diagrams I linked.

Depends on the age, I suppose. On mine, parts 019 and 020 on the diagrams on the below page are rubber. https://www.viessmannspares.co/AA_WB1A_Parts_list___exploded_views,_click_on_images_to_magnify/p917437_8839287.aspx

I too have a WB1A, and I see the same symptoms. My experience is that to fix it, every year or two I have to remove and flush through the rubber hoses because they become blocked with black "granules". Known as "crunchy hose syndrome" I believe. This leads to much reduced circulation, causing...

Can you not feed both showers from the one pump?

Personally, I use plastic pipe but with brass compression fittings. I love the way the pipe is flexible, so you can often install it as one unjointed length (through holes in joists if necessary) with no intermediate fittings necessary. It makes me smile when I see plastic pipe installed in...

My boiler predates the "100-W" series. Yes, it's wired to give hot water priority (W-plan) - if the boiler is plumbed as a 4-pipe installation then the internal W-plan diverter valve is used by default. Mine's actually plumbed as a 2-pipe with an external 3-port valve. It's my opinion that in...

I have a Vitodens 100 WB1A system boiler from 2006ish. The boiler flow temperature is set by the knob on the front for the heating, but changes automatically to 80 degrees C while HW is demanded. That's because the heating thermostat and the cylinder thermostat are wired to their individual...

Those Grohtherm Wireless showers are really temperamental. I have two of them (the high-pressure ones rather than the pumped ones), and I find that turning off the mains electricity to the unit in the loft for a minute, then turning it on again, temporarily fixes many of the "getting stuck on...

I have the high pressure (unpumped) version. I haven't experienced your symptoms, but my unit does periodically fail to control the temperature properly. Turning off the mains power for a few minutes, then turning it on again normally fixes this behaviour. I suspect these units contain...

Viessmann do a fixed-price repair service, which is cheaper than the cost of a new PCB (at least, it was a couple of years ago when I had similar problems). Sounds like this may be your best bet?

Well, this discussion has prompted me to pay a bit more attention to the problem... Last evening I replaced two more of the heads, and realised that they were two that I'd already replaced previously. Examination revealed that, in fact, it's the valves that are leaking around the pin...

The goo is yellowish in colour. As best I can tell, it comes from the head itself. It oozes down the outside of the metal bit of the valve before dripping onto the floor. But then it sets harder / stickier, presumably as it cools. It's difficult to tell how much the head's performance is...

I have TRV4s throughout my house, but I'm not happy with them. Many of them have leaked a sticky substance (luckily onto laminate flooring and dark carpet, not the cream carpets - yet!). Is this normal? Six of the TRV4s were fitted in about 1998. We extended the house in 2008, adding seven...

One of my Grohe wireless showers also displays Service 13 from time to time. The shower becomes scalding hot, then shuts off (for safety reasons, I imagine) displaying "Service 13". Restarting it after a wait, I can turn the temperature all the way down to "LO" yet still the shower is warm...

This Toolstation one is what I use: http://www.toolstation.com/shop/Water+Hardness+Test+Kit/p91729