Broken MVHR unit advice

[Dylan Woods]

Hello all,

I’m looking for some advice regarding a recently broken MVHR unit in my flat, model Heatrae Sadia Advance.

The unit is out of warranty and Baxi, who provide product support, have suggested I employ a Heating & Ventilation engineer to diagnose the problem.

Before I do, I would like to attempt to resolve the issue myself, perhaps with some help from these forums. Where I am up to:

• I have recently changed the filters on the unit and given the fan unit a clean.
• I performed a reset as per the manual.
• I note that my unit doesn’t have an LED indicator on the top (see attached photo) so I am unsure why the malfunction has happened.
• When I turn the unit off by mains power, and then turn it back on, the unit makes a vibrating sound for around 10 seconds and then stops.
• Baxi have recommended I check for blockages in the ducting or that I may have any issue with the motor assembly or PCB, both may need replacing.

My questions / thoughts from this are:

• Does anyone have experience of this issue?
• New components are very expensive (upwards of £550) and I have no guarantee that these will fix the problem. It seems a big risk to purchase these blindly. See links below to components.
• If the ducting is dirty, would this stop the unit from working altogether? We’ve had the unit for about 5 years.
• I found a similar looking MVHR unit (link below) and wondered if this might be a more cost effective replacement than attempting to replace individual components.

Any help or insights would be much appreciated.

Or if I have come to the wrong place, guidance on where I should post this question would also be appreciated.

Cheers, Dylan



Heatrae Sadia Advance 200 Plus Motor Assy - 7035035 | Spare Part - https://www.showerdoc.com/heatrae-sadia-advance-200-plus-motor-assy-7035035

Heating Spare Parts - https://www.heatingspareparts.com/boiler-spares/partno/7035035/507129

Itho Daalderop HRU 200 ECO unit E RFT High-rise 200m³/h - https://www.ventilationland.co.uk/product/27745/itho-daalderop-hru-200-eco-unit-e-rft-high-rise-200m-h.html?utm_source=googleshoppingUK&utm_campaign=googleshopping-FeedUK&gclid=Cj0KCQjw2cWgBhDYARIsALggUhqMqR2fvlrLrRGSZYLv6JYfkKiOJ4pMz7CLU8yueYthDoUlDgeQqrYaAq9gEALw_wcB