HP04 Hot + Cool Standby Power

Hi @Plug1 

Very interesting. It hadn't occurred to me that my Dyson could be drawing extra wattage when in standby. Double checking the guide, it certainly shows less than .5W. 

I’ve got an older power meter, so it may not be as accurate. That said, testing both the heater purifier and cool purifier we have. The former .45, while the latter is .38. No where near the draw you’re seeing.

What is it your using to record 20W? Have you tested directly in the mains in multiple plugs, on different circuits? 

I’d be keen to see what others are seeing..  

Hi @DavidTaylor,

Thanks for your data :-)

According to the spec: https://www.dyson.com/content/dam/dyson/for-business/business-refresh/docs/us/air-treatment/pure-hot-cool-tech-spec-us.pdf

It should be less than 0.5W, so even your readings are about 10x what it should be. I am using a digital power meter that I have calibrated on other devices, so I am fairly confident of my 20W reading.

It would be great to see what others measure.

@Plug1 you’re welcome. 

However, I admit that I placed the decimal point in the wrong location. Readings are .45 and .38 respectively. 

Below that which stated by Dyson.

David. 

My hot+cool standby wattage is 0.49W. 

Out of interest, I tested the wattage when the unit met the Auto Target. I record 18W. 

My manual shows that the machine being turned off is equivalent to standby. @Plug1 are you recording  a 20W draw with the unit switched off?

If you are, I’d suggest contacting an electrician or even Dyson directly. Certainly doesn’t seem right.

Thanks both for you info. @WoodenMan it is sounding like there is something wrong with my machine. The 20W is when the machine is powered off; so the display is off and the fan is off and it should be just basic wireless/control circuits running. From what you have reported, this is clearly not normal. I will investigate further and report back.

I disassembled and disconnected all the circuit boards I can access and still get 20W, I am thinking the most likely problem is with the power supply, which I think is in the base and difficult to get at :-(

The slightly surprising thing is that it seems to work fine apart from the high standby power.

I would be interested in any thoughts from someone at Dyson. Ours is probably 3 years old now.

Hi @Stuart, as a qualified electrical engineer, I fully understand your concerns with safety. I have to say that I am very impressed by the design and quality of manufacture of my purifier. I will follow up as you suggest.