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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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Blows cold air turn heat on


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My 2000 grand prix blows out cold air when its on heat


Could be air in the cooling system , try an bleed the system . On top of the thermostat housing is a bleeder valve , with the engine up to temp. open valve till coolant comes out . Is the coolant full ? What color is the coolant ? Have see where coolant turns like a muddy color an clogges the heater core an engine coolant passages . Check the heater hoses going into the fire wall ,are they hot ? Does your grand prix have manual or automatic climate control ? Duel zone ! Do you hear a clicking sound behind the instrument panel ? Bad temp blend auctuator .

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Having trouble with the heater in my 2006 Dodge Grand Caravan. When the car is driving around the neighborhood or stopped at an intersection, only cold air blows. Only with extended constant acceleration,...


Yes . Your heater is actually not an Electrical Heater or a Separate Heating system . Actually if uses the same Radiator Line . When Radiator is heated up it is cooled down with radiator Fan and coolant . But when you use the heater function , this hot fluid is passed through a heating coil tube and blower fan is used to take that heat inside the car .
So I think now you understand , why you are not heated up in a short run . You really need to make the Engine + Radiator Warmer ( that is natuarlly happened when you run more) to get Warm air inside.
Please rate my answer fairly and Support me With Regards and Season's Greetings Deepak Richard

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1 Answer

The heater will not blow warm air until you start driving. The fan blows but its cold air. Once you start driving the air turns warm. Why?


There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

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Gas furnace is constantly blowing cold air


An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!

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No rear heat


The rear vent system has a separate heater core/blower system. heater core could be plugged up or the coolant lines going to rear heater core are plugged. could also be low coolant/faulty water pump not producing enough pressure, or air in the cooling system which will need to be bled if so.

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Heater blows cold air


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If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
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the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation dodgeboy6069@yahoo.com

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