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MHRV not extracting

  • 17-01-2022 3:58pm
    Registered Users Posts: 434 ✭✭ tomred1N

    Any one have any ideas.

    Have changed filters , pushing in cold air in all vents but not extracting from any vents

    Its an ITHO HRU ECO , 10 years old , no issues until now !



  • Registered Users Posts: 2,700 ✭✭✭ MicktheMan

    Had a similar issue with my system a few years back. Thought the extract fan had failed but was good when I checked it.

    The issue was a clogged extract grill (I had changed the grill for a ss bullnose type and in it was a fine mesh that got clogged with fine dust and organic growth over time)

  • Registered Users Posts: 434 ✭✭ tomred1N

    Thanks …….Opened up the unit after downloading instructions and messed around with bypass / freeze protection and after a while I could feel warm air ……..went back down from attic and it was extracting again …….no idea what I did but maybe the freeze protection mechanism had activated and not reset ……..working away fine again anyway 👍