HP09 moderating temperature with cool air after heating | Dyson Community
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HP09 moderating temperature with cool air after heating

  • January 11, 2024
  • 1 reply
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Hi, I know a similar question has been posted before but the question and answer didn't quite clarify the issue. Let me explain what's happening in my case.

I am in a cold climate and right now I need my Dyson in heat mode to keep my office room warm. When my room reaches the set temperature, the fan heater stops blowing (this is fine and expected). However, sometimes I the begin to feel a cool breeze on my back and when I turn around, I see the Dyson is blowing a small cool breeze, which I can feel with my hand. Looking at the temperature display, it shows 1° higher than my set temperature, so it seems that the fan is trying to cool the room down. This is not what I want to happen.

Since it is a cold climate, I am fine with the room cooling itself down over time. I don't need the fan to assist with dropping the temperature as this means the heater comes back on again in faster intervals and costs more money to run.

Is there any way to prevent the fan from blowing cool air after the heater reaches temperature? 

Best answer by Anonymous

Hi @djwinger, thanks for your post. The cool air you are feeling is when the purifier mode has kicked in. There is no way to actually turn off the purifier mode. Is the machine set to Auto mode?

If you do not want to feel the cooling fan, it is best to purchase our AM09 heater fan instead. 

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  • January 12, 2024

Hi @djwinger, thanks for your post. The cool air you are feeling is when the purifier mode has kicked in. There is no way to actually turn off the purifier mode. Is the machine set to Auto mode?

If you do not want to feel the cooling fan, it is best to purchase our AM09 heater fan instead. 


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