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Brivis central heating problem code ''busy 40 H1

I have started the heating system and it is blowing cold air constantly and will not reset. I cannot turn the heater off.

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Hi, i recently had the same problem with mine and found that the inside adapter was unplugged. I plugged it back in and all is working find, so if anyone has the "Busy Hi 40" message on the control box the check the adapter :)

Posted on Dec 21, 2010

  • StuartTraver Feb 20, 2011

    I just had this problem with my unit and found this comment which didn't help me, but I was able to fix the problem after a few hours and a bit of detective work, saving myself several hundred dollars in repair costs. There is a small overheat sensor inside the unit (Brivis MPS 20HE) which is connected to the control unit by an orange wire, and it turned out that the sensor had just got old and died. When I removed it, there was a visible crack in the ceramic surround, and when I shook it, it rattled like a busted light bulb, which isn't normal. It's not hard to find and replace (requires removing half a dozen screws and just a little bit of care), and the sensor only cost $35. Just thought I'd share for anyone with a similar problem.

  • Anonymous Mar 29, 2017

    Thanks for sharing this Stuart, it saved me hundreds too. In my case it looks like it was a corroded or loose connection to the overheat sensor, I re-terminated the cables at the sensor end (which were visibly corroded) and re-seated the connector at the control unit end, and now it's working.

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