iainf

all done and dusted as far as the bearings are concerned - I did leave the original intake bearings in out of interest to see how long they last as they are still sweet. Have made it a bit easier to service the next time - keyholed the wall hanging brackets so can hook it on then tighten - originally designed by someone who has never actually had to install one (or anything much at all tbh). I used the better sealed version, not the original metal shield as the failed bearing was the one most exposed to the humid extract air, hopefully a very long time until that one needs doing again. Videos on you tube we linked above helpful, care points are to make sure you lift off and place the fan driver PCB vertically on and off in the correct orientation - there's a sensor has to fit into it's slot and 3 power pins to get into their connectors on the PCB, mash those and big bills. When cleaning the fan be careful not to disturb any of the metal balance weights - they are really good quality fans and one thing that is being paid for is each one individually balanced - they are in the slots front and back so easy to clean dirty bits of fan without disturbing - nice design. issue I have now is loss of temperature and now humidity readings not fixed by new sensor - have asked how much a new controller is. Calling for bypass all the time so disconnected that which is ok for now. Anyone else had any issues with the bluebrain controller - mine is early one I think so maybe teething troubled version of pcb that doesn't like getting turned off and on.

that's for 4 bearings, may as well do both fans even though outside air induction one seems fine at the moment, pain to strip it all down. Heat exchanger amazingly clean - guess all that filter didn't catch was on the rotor so not complaining 🙂

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The C3 spec has extra clearance for high temp running so may not be the best if it rattles around as not running hot in this application. I've gone for the low friction rubber seal ones as the bearing that's gone is the more exposed one. I've bought a removal tool, same size bearing on skateboards so tool sensible price, don't think in tight anyway so probably ok to get out carefully without special tool. I'll post more once got the tool and bearings.

I have extracted failing fan, very very dirty rotor covered in dust n fungus so that will need a good clean, hopefully not disturbing any balance weights. Wonder if growth built up in balance? Fan motor number there, I'm timed out for tonight so will have to pick up next opportunity. There are YouTube vids for similar fans if you use search on bearing replace ebm papst fans, not sure which one will be closest to the hrx2 one yet. No connectors, wire ends straight to screw terminals in control panel. Motor I have to replace bearings in was already a replacement as I had a dud fan bearing in new unit, pretty annoyed as had to strip unit down to get into loft, rebuild and then find duff bearing, refused to send whole unit back as they wanted, so got away with getting just the replacement fan.

I'm very hopeful that it will be a bearing swap. No way should we be scrapping whole units just for the sake of some fans that should be serviceable. Does anyone know the markup on them? RS prices are in that region for similar fans, here's hoping they haven't deliberately made them unserviceable or really awkward to keep alive. The hex will be due a clean anyways as have never done it since installed, just the filters at season change, I take air from the loft in winter rather than from outside. Sounds like I may be having to prioritise this as bearings much louder so have had to turn off. I'll update with what I find.

I'm very hopeful that it will be a bearing swap. No way should we be scrapping whole units just for the sake of some fans that should be serviceable. Does anyone know the markup on them? RS prices are in that region for similar fans, here's hoping they haven't deliberately made them unserviceable or really awkward to keep alive. The hex will be due a clean anyways as have never done it since installed, just the filters at season change, I take air from the loft in winter rather than from outside. Sounds like I may be having to prioritise this as bearings much louder so have had to turn off. I'll update with what I find.

Hi, I find myself in same position, 2017 diy install, balance flow and return per room so can run minimal speed and not defeat acoustic and smoke seals on doors. Surprisingly had a sensor fail - will be conformal coating the replacement so it lasts longer, went to put new sensor up near unit (will run with faulty temp sensor with bypass disconnected) and heard bearing on it's way out. Huge price for replacement fan. I believe likely to be papst fan. Previous house I had an airminder and replaced the bearings in the papst fans in that - brushless motor so no armature / brushes to wear, just the bearings. hopefully Papst motors are still possible to replace bearings. There will be more of these needing done and huge waste to replace a perfectly good motor just for the sake of some bearings. I can't find record of what I bought the last time, but I do remember I went for the uber version as cost was nothing compared to new fan. I'm planning on replacing the bearings in this unit now, however getting the time is another thing. Can you get the model number of the fan in the photograph and verify it is a papst?