Question about Dyson AM04 Hot Cool Fan Heater White

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Dyson hot and cold fan only works in hot mode

Works fine in hot mode, will not operate in temps below 25c

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  • Official Brand Answer
  • 2,572 Answers

Hi there, it's Jack at Dyson.

When you adjust the target temperature of your Dyson Hot fan heater (shown on the LED display on the base), you're setting the target temperature you would like the room heated to. The actual temperature of airflow produced by the fan heater will not vary.

If the heater won't run below 25 degrees, this is likely to be because the temperature of the room you're in is equal to or warmer than 25 degrees. The heater will only turn itself on if the temperature drops below 25 degrees, and once the room temperature reaches this target once again, the fan will turn itself back to monitoring mode.

I've attached our Getting started video below which shows how to adjust the temperature, using the remote or the controls on the base.

I hope this makes sense. It sounds as if your machine is working correctly, but if you'd like any further advice from our experts you can reach us at 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).

Posted on Mar 11, 2014

  • 1 more comment 
  • William Funk
    William Funk Jun 07, 2014

    Why does it not give off cool air? It is supposed to be a hot/cold machine. How do you get it to function with cool air???? Thanks

  • AskDyson
    AskDyson Jun 11, 2014

    Hi William, it's Jack at Dyson.

  • AskDyson
    AskDyson Jun 11, 2014

    When you lower the target temperature until the LEDs display '0', you'll notice the on/off light turning blue to indicate the heater is now running in fan-only mode. It will then circulate unheated air to cool you, and you can use the remote or the control on the base to adjust the power and oscillation to suit your needs. I hope this helps.

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Posted on Jan 02, 2017

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Hi Charlie, it's Jack at Dyson.

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