What size is the fuse on the Blueair purifier.

Hi - I have a 503 and am trying to determine if the issue of my unit not working is also due to the fuse. Was the fuse for the 555 located under the housing cover beneath the fan? I removed the sides of the unit and partially disassembled it, but haven't been able to get to the the circuit board underneath the housing - I would need to disconnect all the wiring and clip the zip ties first, but wanted to make sure I'm looking in the right place before doing so. Thanks! Hi - I have a 503 and am trying to determine if the issue of my unit not working is also due to the fuse. Was the fuse for the 555 located under the housing cover beneath the fan? I removed the sides of the unit and partially disassembled it, but haven't been able to get to the the circuit board underneath the housing - I would need to disconnect all the wiring and clip the zip ties first, but wanted to make sure I'm looking in the right place before doing so. Thanks!

Kelvin - possibly too late for you, but I just took apart my 555 EB - and yes, the fuse is within the housing that is located under the fan, and the fuse is covered (on mine) with a transparent/translucent blue silicone cover (easy to lift off, then the fuse is visible). Unfortunately for me, I checked the fuse, and it is fine. There is only one fuse for the unit - so if the fuse is blown, you should have no power at all. For mine, I get low speed fan, but not higher speeds, nor any fan spinning under "auto" mode. It must either be 1) a relay, 2) the 120 vAC --> 230 vAC transformer or 3) the high-speed winding on the fan motor itself. Blue Air has horrible customer service, closed their repair facility, only answers their phone after a 30 minute hold and then has no useful information. There is no schematic available so home repair will be a challenge. I may end up replacing the fan unit with a 120v variable speed (PWM controlled) fan, just replacing the guts of the Blue Air so that I can still use the housing and the filters (but no auto mode). Kelvin - possibly too late for you, but I just took apart my 555 EB - and yes, the fuse is within the housing that is located under the fan, and the fuse is covered (on mine) with a transparent/translucent blue silicone cover (easy to lift off, then the fuse is visible). Unfortunately for me, I checked the fuse, and it is fine. There is only one fuse for the unit - so if the fuse is blown, you should have no power at all. For mine, I get low speed fan, but not higher speeds, nor any fan spinning under "auto" mode. It must either be 1) a relay, 2) the 120 vAC --> 230 vAC transformer or 3) the high-speed winding on the fan motor itself. Blue Air has horrible customer service, closed their repair facility, only answers their phone after a 30 minute hold and then has no useful information. There is no schematic available so home repair will be a challenge. I may end up replacing the fan unit with a 120v variable speed (PWM controlled) fan, just replacing the guts of the Blue Air so that I can still use the housing and the filters (but no auto mode).