vala Posted November 10, 2022 Share Posted November 10, 2022 Up until a few days ago my UFH system has been working as intended and silent. Then suddenly I started to notice a lot of noise coming from it, sounds more like at the pump end. Spoke to Wunda and they expected this noise to be air related so I set about a couple of days ago and bled the system. A little bit of air came out, and upon restarting the pump and system is back to working, as far as I'm aware, correctly and silently. Then this morning it's back to being noisy, I've attached a video in case anyone can offer any suggestions. https://vimeo.com/769310848 Link to comment Share on other sites More sharing options...
ProDave Posted November 10, 2022 Share Posted November 10, 2022 That sounds like mechanical pump noise. Link to comment Share on other sites More sharing options...
PeterW Posted November 10, 2022 Share Posted November 10, 2022 Sounds like a failed impeller as cavitation isn’t that loud normally. How old is it ..? Link to comment Share on other sites More sharing options...
vala Posted November 10, 2022 Author Share Posted November 10, 2022 @ProDave @PeterW thanks for your replies. Pump along with the whole system was first commissioned around Jan/Feb this year. Link to comment Share on other sites More sharing options...
SteamyTea Posted November 10, 2022 Share Posted November 10, 2022 Is there a filter you can easily check to see if there are any bits of the pump in it? Link to comment Share on other sites More sharing options...
vala Posted November 10, 2022 Author Share Posted November 10, 2022 @SteamyTea the system was making this noise late last week/over the weekend. So on Monday the system was bled using a hose through the fill valve. No bits of pump came out during this process (I had the hose on the return go into the bath). Wunda have messaged back and said the green light at the top denotes the system is in air purge mode but I don't think that's correct. I believe that just tells you the pump is running. The air venting mode it has is indicated by a series of flashing light on the pump setting and pump speed lights. Link to comment Share on other sites More sharing options...
dpmiller Posted November 10, 2022 Share Posted November 10, 2022 I'm gonna channel @Nickfromwales just for a moment and ask you to check whether the arrow on the pump body is pointing the right way up? Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 10, 2022 Share Posted November 10, 2022 (edited) Could just be a bit of solder that’s found it’s way into the impeller housing of the pump. Best to open the pump up and visually inspect the impeller housing and impeller blades, before continuing on with any further processes of elimination. A bit of solder / other debris will result in a quiet pump then becoming sporadically noisy. That situation occurs when the pump stops and the debris drops out of the housing, with gravity, then it eventually gets sucked back up into the pump and around you go. It’s that, or a failed / failing pump. Air is not the culprit, I very much doubt that, unless it’s so bad that the pump is running bone dry. If it was, you’d have no flow registering on the manifold flow gauges. Edited November 10, 2022 by Nickfromwales Massive thumbs 1 Link to comment Share on other sites More sharing options...
vala Posted November 10, 2022 Author Share Posted November 10, 2022 Thanks all for the replies. Got back home this evening, UFH is on and pump is back to being silent🤯🤯🤯 I'll check it again tomorrow morning to see if this may just be happening in the morning. Assume this either now means it's not a damaged pump, or the piece which was causing problems has been forced around a loop??? Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 10, 2022 Share Posted November 10, 2022 36 minutes ago, vala said: Thanks all for the replies. Got back home this evening, UFH is on and pump is back to being silent🤯🤯🤯 I'll check it again tomorrow morning to see if this may just be happening in the morning. Assume this either now means it's not a damaged pump, or the piece which was causing problems has been forced around a loop??? I reckon it’s debris. Even a tiny sliver of copper or solder can take days to grind down to a point that it’ll just ‘work it’s way through’. Keep us posted please! Link to comment Share on other sites More sharing options...
vala Posted November 11, 2022 Author Share Posted November 11, 2022 So situation first thing this morning with 1 zone calling for heat......silence! 🤯 Will get someone to monitor it during the course of the day, and then I'll do the same over the weekend. Assume if I remove the 4 bolts on the front of the housing that will give me access to the impeller to check for any debris lodged in there? Link to comment Share on other sites More sharing options...
vala Posted November 18, 2022 Author Share Posted November 18, 2022 *Update* So pump has been silent since the 11th however I have noticed the flow rates have been between 0 and 1 (have checked with the loop lengths installed and 1 zone in particular should have a flow rate of 2 l/min). Spoke to Wunda about this and they are now suggesting trying out the standard actuators so have sent some out in the post (may arrive next week). I also spoke to Salus today who noted these actuators are very much fit and forget and have suggested upping the pump speed to 2 (was previously set at 1 due to only 4 ports on the manifold). Once I changed the speed back again came a whole host of noises (sounded much like air) and the green and red flashing light on the pump. One reasoning for this according to the Wilo manual is air in the system. So I entered the venting mode, its done its thing and back to being silent on speed 2. But I did notice some movement at the flow meters during this venting mode and in particular little movement from one of the meters as shown in the video below. The zone for that flow meter also has been the one with little to no flow through it, yet is also the largest of all the loops. Plan is now over the weekend at some point to get a hose pipe on it and see if there's any air in the whole system again. But whilst I'm doing work to the system am thinking probably best to open up the pump and check for debris as per @Nickfromwales suggestion. Can anyone confirm its just the 4 bolts on the front to be undone to view the impeller? Link to comment Share on other sites More sharing options...
PeterW Posted November 18, 2022 Share Posted November 18, 2022 2 hours ago, vala said: Can anyone confirm its just the 4 bolts on the front to be undone to view the impeller? Yes but isolate it first or you will get wet …. 1 Link to comment Share on other sites More sharing options...
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