tomaus

I’ve just been up in the loft and there definitely isn’t a switch anywhere. The unit was installed when the house was built so not a DIY job. Based on the Nuaire instructions I think the bypass might be automatic, so maybe an issue with a sensor or the control board.

I don’t have a thermometer to test with, but the air coming from the vent is colder than the ambient internal temperature.

That’s interesting, I wasn’t aware of that. The unit doesn’t have any controls for the bypass, and user manual does not mention needing to change anything in winter. Seems strange that the issue is only effecting one of the vents if it’s the bypass causing the issue.

It's a Nuaire MRXBOX95-WALL, not much in the way of controls just some dials for fan speed.

I wasn't aware the heat exchanger has different modes, there were no instructions left by the developers about needing to change settings on the unit. Thanks, I'm fairly certain the water is on the outside of the pipe as it seems to be pooling in the loft and the water coming through the ceiling is dripping from the outside edge of the metal ring on the ceiling. Interestingly this drop is no the closest to the heat exchanger and there are no signs of the damp on the other pipe drops.

Hi all, I live in a 9 year old hour which has a Nuaire MRXBOX MVHR unit, the past few years I have had a reoccurring leak through the ceiling vent in one of the bedrooms. The issue only occurs in the winter in cold temperatures when the outside air temperature drops to close to freezing. Based on my reading I guess this is most likely a result of poor insulation on the ventilation pipe drop for this room, but I'm not sure what I should be looking for to find the fault and how to repair it. Does anybody have any experience troubleshooting an issue like this, or a guide on how to correctly insulate the pipework? Thanks in advance, Tom

Thanks Jack, I'll make a post in the relevant sub-forum,

Hello all, I haven't used a forum for a long time, but found this site helpful so far and looking to get more information from the community. I'm here looking for support troubleshooting problems with an MVHR system leaking through the ceiling vent on the intake circuit, I think I've narrowed it down to poor insulation on the one of the drops but not sure how to remedy the issue, Thanks,