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Hi @JohanBerg I am sorry that I am only replying to your message now. I noticed the same behavior of the unscrewed actuator, which started working for a while, but after re-screwing it jammed again. Since I had already bought a new part, I immediately proceeded to replace it. My way of re-installing the screws, after probably two hours of lying with my head under the dashboard, I decided to stick the screw to my finger using a small drop of glue. Later, I regretted that I did not immediately decide on such a solution. I would save a lot of time. I read on some forums that what breaks down in these actuators is a small rotating resistor. It can be purchased on popular portals such as AliExpress and then replaced it. However, I did not want to risk using a car in which this actuator could break down again, during a holiday trip, for example 🤔

So I fixed the issue and I want to share how I did it 😁 I bought new part. Factory installed module V426 was number 5Q0907511A but part available in official distribution currently has new number 5WA907511C (note, that I write about part for Denso HVAC unit). Removing the dashboard is not required to replace V426/V428 module (in LHD vehicles) although the official service manual begins with this step. Access to this part is possible from the bottom - under steering column or as you prefer: above pedals. If you want to do that without removing the dashboard you should remove knee airbag (mounted on 3 torx screw) and next: remove left footwel vent (mounted on only one torx screw). You don't must unplug knee airbag, you just need to unscrew it and rest against on the center tunnel. When you remove this two parts, you get access to problematic servomotor. Be very careful when removing screws from V426, because when they fall, it will be very difficult to locate and remove them. With the screws removed, you remove the module from the climatronic mechanism axis, and then you need to unplug the plug - a small screwdriver may be useful, but there's not much space to work with both hands. In fact there is no space, so you have to work in a truly paralytic position. When you disconnect the plug, the module is ready to be removed. I have one advice for you: before you start unscrewing the module, restore power to the car and turn on the ignition. Next, turn on the ventilation and switch the airflow directions (face, feet, windshield) looking in front of the removed footwell vent, watch if the flaps inside the HVAC unit moves when you click the buttons on the air conditioning panel. In my case, the flaps were dead. Mounting new part - now the true play starts. Step one: connect the plug to new module but not try to mount it yet. Next: turn on ignition and try to choose combination of climatronic switches to set up new module in position which allows to to mounting its on axle of HVAC unit (in other words: you have to set the new motor in the same position as the old, disassembled module was in) When the axle and new part is synchronized, you mount servomotor on the place. Then you screw the motor with two screws: at the bottom and top. Installing the top mounting screw is dramatically difficult. Putting the top mounting screw is so heavy because there is no space at all to grab it with even two fingers. A moment of inattention and the screw drops, and its find is another challenge. When you screwed the motor with the two screws, turn on the ignition and check the flaps again during switching the airflow direction on the air conditioning panel. In my car the flaps came to life. You will also need to perform adaptation and read errors from the HVAC controller. The adaptation can be started on the air conditioning panel - turn on the airflow: to the windshield, to the legs and to the face vents, and then press "AC" + "front vents" buttons at the same time for 3 seconds. When its finish again check errors in HVAC module and clean them. If adaptation was finished correctly errors shouldn't back. During adaptation you can observing via left footwel vent that flaps are working right. At the end you mount again footwell vent and knee airbag and are you going for a test ride to testing that HVAC works right. If you unplugged battery you should also make test ride for few km's, next check and clear faults in all car modules. In authorized Skoda service center in Polad repair of this issue costs about 450 EUR (with dashboard and central tunnel removing). I repaired myself this fault for the price of about 70 EUR 🤭 However a lot of self-denial is required for made it. Good luck 😁 and sorry for my English...

Yes I know the part number. In my case the number is 5Q0907511A. But you should like to know, that in Skoda Octavia were installing two types climatronic unit - from two manufacturers: Denso and Valeo. HVAC module in my car was produced by Denso. In cars with Valeo's HVAC the part number should be: 5Q0907511J. Unfortunately, I'm not sure if these two servomotors can be used interchangeably. And one more errata to my previous post: I wrote wrong symbol of the part 11: Heating and electrical manually controlled air conditioning system - air distribution flap control motor: V428 Climatronic - front air distribution flap control motor: V426 At this moment I know that replacement of V426/V428 module in LHD vehicles is possible without removing dashboard despite the fact that the official service manual recommends starting work by removing the dashboard. It's possible, but it isn't easy and not very comfortable.

Hello! I've got the same problem in my Skoda Octavia mk3 '17. I've noticed yesterday that I can't off front vent - blower is blowing on face, independent that I turn on or off switch. When I try to enable blowing "on socks" on climatronic panel - nothing happen. Other functions of HVAC works good. Adaptation which was shown in link above doesn't help. During adaptation I can't hear any incorrect noises, such as crackles or clicking from HVAC flaps or some servomotor. When I plugged diagnostic interface I saw the same fault code in HVAC module (928364). I looked at the official documentation of the heating system in Octavia and concluded that cause of the fault must be a damaged V428 module (front air distribution flap control motor) or some mechanical problem with the flap. The service manual says that on LHD cars, the dashboard must be removed for repair. In RHD vehicles access to the V428 servo motor is quite easy, because it is placed on the same side as LHD vehicles... and it means, that you should remove glovebox and you can get access to problematic part. However, I would like to ask if anyone replaced this motor in left-hand drive cars, and if so, is it really necessary to disassemble the entire dashboard, or maybe it is enough to remove the knee airbag pad and it would be possible to get there without disassembling the board? Today I checked whether the flap motor could not be accessed after removing the instrument panel, but it doesn't resolve problem with access. Servomotor placed too deep...