Stevenwithav

I’ll buy one of these and see if it works

Water hammer? How can I fix it? Anything I can do or is it to complicated? Thanks a video attached to hear the thud IMG_7294.mov

Morning all, I have an issue with my unvented system boiler I’m hoping one of you could give me a heads up on what it could be, When the washing machine is in on I can hear the hot water tank make a thud noise every so often, it also sometimes happens when I turn on the taps, definitely coming from the hot water tank

Also I’ve checked the daily gas usage and it hasn’t changed from prior to this fix

I have the radiators and the UFH set to come on in the mornings, so I had all 5 UFH zones on and 6 upstairs radiators come on, but thats when the ringing sound comes on

Good morning all, an update on this issue, it’s now working as I wanted so thank you all for your input, the only issue I now have is when the pump comes on it has that ringing sound (can be heard throughout the downstairs and the bedroom above) I’ve tried adjusting the flow but the only thing that stops it is if I turn the mixer up but that puts the temperature through the manifold to high, any thought on this, cheers

I’ve adjusted it down to 45 but any lower and it makes a loud ringing sound

@ProDavealso the temperature on the pump shows 65 degrees, it used to be about 50, is that normal

@ProDaveI have attached the grey to the greys from the 2-port valves, I turned up the UFH thermostat and the pump kicked in and the boiler started up, so that’s working as I wanted, thank a million, but is there any issue that can come from it being like this, like one of the other fellas on this thread mentioned something about “short cycling” and it using a sh*t load of gas! Or is this set up how it should have been? (the grey wires went into this terminal block with the arrow)

And if that works do you think I could just add a separate 2-port valve on the UFH pipe going to the pump and wire that into the same connectors in the junction box to be able to control only the UFH?

Got it , thanks

NICKFROMWALES: Yes if the boiler is already on for the rads or the towel rails and I turn up the UFH thermostat then the hot water will circulate around the UFH, that’s the only way I have been using it, but the problem with that is the rads and towel rails are on timers to come on and off, so if it’s particularly cold and I want to warm the downstairs it just circulates cold water around! So I really need to be able to heat the UFH independently, PRODAVE: if the gray wire is linked to the 2-port valves and I turn up the UFH thermostat should that call for heat? p.s I can’t figure out how to reply directly to your message

I have change the settings, I changed them to suit our need as a family, it works and heats up but say in the afternoon when it gets cold in the house and I turn up the UFH thermostat, the pump starts up and it circulates cold/luke warm water, so even though the settings have changed it never circulated hot water when the rads/towel rails aren’t on

So do you think the installer deliberately made it so the UFH and the Rad/towel rails are all connected so that they come on together, in other words I set the Radiator thermostat to come on at say 6am which calls for heat starting the boiler, which in turn heats the Rads and the UFH?

There are three thermostats, one for the hall, one for the lounge and one for the kitchen are (nothing is big so has three loops), in the picture it only shows the lounge has flow but all the others do usually have flow, just wasn’t on at the time of the picture,

The top black circle shows the connection block that the black wire is connected to, the bottom black circle shows the gray not attached to anything, if I connect the gray to the connector block with the other grays, when the UFH calls for heat will that not open the 2-port valves allowing hot water to flow to the hot water/Rads/towel rails when I just want the UFH to heat up? thanks

I don’t have a multimeter but can see there is voltage in the right terminal which does lead to the pump, but no voltage in the left terminal which leads to the 230v junction box, The grey and black wires are going to the junction box, inside the black is connected to a connector block with the orange wires from all three 2-way ports, and the gray wire isn’t connected to anything,

Here are the photos inside the h-box

so the three 2-port valves don’t run to the UFH, one is for the hot water, second for the towel rails and the third for the upstairs radiators, the UFH doesn’t have a 2-port valves, I think the wire coming from the WUNDA H-Box going into the bottom of the boiler is what calls for the boiler to kick in to heat the UFH, so I might have an issue with the H-Box

Morning, thanks for the replies, the UFH mixing valve seems to work fine, The problem I see with leaving the radiators thermostat in control is I like the evenings upstairs to be cool for bed but the downstairs warm for the evening, but by having the rads go off at about 7 the downstairs gets cold, then when I turn up the UFH thermostat it never warms due to being unable to call for heat, (I’d have thought the cable coming from the WUNDA control box to the boiler was to independently call for heat, is that wrong?)

Hi everyone, I'm new to this forum and hoping for some advice on my underfloor heating (UFH). I recently moved into a four-year-old house with UFH downstairs and radiators upstairs. I've noticed a strange issue: the UFH only seems to heat up when the upstairs radiators are calling for heat. For example, when the radiator timer is on, the boiler kicks in, heating the water that then circulates through both the radiators and the UFH. However, if the radiator timer is off during the day, and I turn up the UFH thermostat, I can see water circulating through the manifold, but it's only lukewarm or cold. My system has three 2-port valves: one for the radiators, one for the towel rails, and one for hot water. However, there 2-port valve for the UFH manifold. It's a WUNDA system, and a cable runs from the WUNDA central connection box to the boiler, which I assumed controlled the UFH's call for heat. But clearly, it's not working as expected. What am I missing? Any help would be greatly appreciated. I'll attach some photos of my system to give you a better idea of the setup. (ignore the orange cable that’s an extension for something else) thanks