Difficulty

Difficult

Steps

8

Time Required

                          15 minutes - 1 hour

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1

  • Fix Overheating Error in Dyson AM09
  • 8 steps

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  • BackDyson Hot+Cool Fan Heater (AM09)

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What you need

Step 1

              Fix Overheating Error in Dyson AM09
  • All you really need to do is set the fan on high in cool mode, then pulse compressed air into the linear portions of the rearward slot (where hot air normally comes out).
  • Beware you will get a lot of dust coming out the forward slot (where cool air comes out). It needs to be on cool to open a flap that lets the dust out the front.

All you really need to do is set the fan on high in cool mode, then pulse compressed air into the linear portions of the rearward slot (where hot air normally comes out).

Beware you will get a lot of dust coming out the forward slot (where cool air comes out). It needs to be on cool to open a flap that lets the dust out the front.

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Step 2

              Remove fixing bolt for air slot manifold
  • If you want to get to the heating elements, you have to remove the top section above the cylindrical part with all of the little vent holes. Everything above the parting line comes off in one piece.
  • First pull the little D shaped bolt hole cover at the base of the oval - it pulls up. There is a T8 screw underneath that must be completely removed.

If you want to get to the heating elements, you have to remove the top section above the cylindrical part with all of the little vent holes. Everything above the parting line comes off in one piece.

First pull the little D shaped bolt hole cover at the base of the oval - it pulls up. There is a T8 screw underneath that must be completely removed.

Step 3

              Unlock air slot manifold
  • This part twists about 15 degrees to unlock, then separates easily. The twist direction to unlock is conventional for a (right handed) bolt or nut - counterclockwise relative to the part below. Gripping the cylindrical base by hand to do this is not easy. Fortunately, my device has a grippy finish, so it was easy to use a belt as a strap wrench.

This part twists about 15 degrees to unlock, then separates easily. The twist direction to unlock is conventional for a (right handed) bolt or nut - counterclockwise relative to the part below. Gripping the cylindrical base by hand to do this is not easy. Fortunately, my device has a grippy finish, so it was easy to use a belt as a strap wrench.

Step 4

  • You may find it easier to work with the cables if you release the fan core from the tilt stage, by removing the four T8 screws underneath the fan core (two each accessible at each maximum tilt orientation).

You may find it easier to work with the cables if you release the fan core from the tilt stage, by removing the four T8 screws underneath the fan core (two each accessible at each maximum tilt orientation).

Step 5

              Careful of the wires
  • Two T8 screws hold down the cover over this. The blade connectors have a little tab lock that must be pushed while pulling them apart. black: temperature sensors, white: heater power (disconnects near the base, under a woven sleeve that slides out of the way. You don’t need to touch the heatshrink). The servo connector pulls apart easily.
  • The arrows show the 4 places to disconnect the wires so you can separate the top from the bottom. The white connectors under the sheath may also have a tiny lock tab that you need to push in while pulling them apart.

Two T8 screws hold down the cover over this. The blade connectors have a little tab lock that must be pushed while pulling them apart. black: temperature sensors, white: heater power (disconnects near the base, under a woven sleeve that slides out of the way. You don’t need to touch the heatshrink). The servo connector pulls apart easily.

The arrows show the 4 places to disconnect the wires so you can separate the top from the bottom. The white connectors under the sheath may also have a tiny lock tab that you need to push in while pulling them apart.

Step 6

              Optional: servo and plate
  • There are two bolts holding the servo down (removed in this photo), and two holding the white plate down. It is not necessary to remove these, but might make things a little easier a couple steps from now.

There are two bolts holding the servo down (removed in this photo), and two holding the white plate down. It is not necessary to remove these, but might make things a little easier a couple steps from now.

Step 7

              Cut around the edge of the air slot trim
  • Use a boxcutter to repeatedly score around the sides and top of the outside trim, in order to gain access to the heater cores. This is glued in place, but around the bottom it is a small amount of glue, so if you completely separate the top and sides you can break the glue at the bottom. The air slot core with heaters will slide out.
  • Be very careful here. Use the thinnest blade possible and repeatedly score rather than doing it forcefully but you really need to get to the base for it to separate. This is hard to without damaging it.

Use a boxcutter to repeatedly score around the sides and top of the outside trim, in order to gain access to the heater cores. This is glued in place, but around the bottom it is a small amount of glue, so if you completely separate the top and sides you can break the glue at the bottom. The air slot core with heaters will slide out.

Be very careful here. Use the thinnest blade possible and repeatedly score rather than doing it forcefully but you really need to get to the base for it to separate. This is hard to without damaging it.

Step 8

  • Two bolts allow you to pull the heater slot cover, which allows you to remove the heater cores. They can be turned out without bending any of the tabs. The same is true of the temperature sensors. The caked on (and toasted) dust can be simply vacuumed off.

Two bolts allow you to pull the heater slot cover, which allows you to remove the heater cores. They can be turned out without bending any of the tabs. The same is true of the temperature sensors. The caked on (and toasted) dust can be simply vacuumed off.

To reassemble your device, follow these instructions in reverse order. Tape the air slot assembly to the outside of the outer housing, or simply ziptie the top of the loop.

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                    breadandbits

Member since: 07/19/2020

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David - Jan 6, 2022

Reply

Hey, thanks for posting this. I used it as a general guide for my Dyson AM01 which also was throwing an error when using the heat function. Opened it up expecting to find and least some dust on the heating elements… and to my surprise and annoyance they were basically clean.

Any thoughts or other ideas? Not sure if there is a temp sensor incorrectly reporting the temperature of the heating elements that I can try to replace?

Thanks

cAL - Apr 19, 2022

Reply

Hi All, thanks for the walkthrough on opening up the heating elements. Same as David, I put up filters around the air intake since day 1 of owning the unit and the elements are clean without any clogs. (Confirmed once I opened up the unit).

I still get the H2 error whenever I use the heating function, I noticed that if I turn it to around 23-24C with the lowest fan speed, the H2 error may not come on. And often time I cannot increase fan speed probably due to some issues with the circuit board or components. I’m suspecting that the H2 error may be due to electrical/component failures because I have 2 units and both experienced H2 error…. I’m suspecting that they were built to have a life timer or something, and when the time comes, it’d fail no matter what.

Did some digging around on the components and it seems that the 2 components next to each heating elements are thermal switch and thermal fuse, I think that’s just for safety purpose and they’re not heat or flow sensors.

David - Sep 28, 2022

Reply

Yea I had actually unplugged the heating elements and set it to heat and still sometimes got that H2 error, which means its not from overheating… since it literally wasn’t heating up then :(

Thien - Oct 24, 2022

Reply

I’m stuck on step 7 since I don’t know exactly where to cut. Is the air slot trim the silver/gray part on the outside? Is there any way more pictures could be provided? Thanks!

Adrian - Jan 1, 2023

It is the outer grey rim that needs to be separated from the white body. See edits to the instructions for photos and details.