Calibration wrench icon appears then disappears [October 2023]

Yes. I have the recent update

I would assume you have the autocalibration then, and maybe that is why the wrench doesn’t appear anymore? I don’t have a Hub, so no idea?

Hope somebody help me then :frowning: I feel that I to put more power now even tho the watts says that I am putting the same effort as usual.

Hi Kevin, I’ve had the same issue! Since I bought the zwift hub over a month ago i used to do a manual calibration every time i launched zwift. Now the wrench disappears after a second or two and calibration isn’t possible. I did contact zwift support but they had no idea what the issue was and asked for a video so they could investigate. Still no closer to sorting the problem. Let me know if you get a fix…

Sorry to hear that from you to Ryan. They contact me and said that the problem is from my Bluetooth. I’ve try change it from a place to another and different devices but nothing fixes it. Let me know is that helped you! I think this problem started since the last update!

HI @Kevin_Lopez @Ryan_Durham welcome to Zwift forums to both of you.

We’re aware of the wrench icon disappearing after a few seconds, and we’re working on fix for that.

In the meantime, your Zwift Hub trainer will autocalibrate as long as the trainer is on firmware version 4.0 or newer, and you’re coasting for at least five seconds from a speed of at least 15 kph / 10 mph. See this Support article for details

Thank you for the info!

My Hub is doing the same thing. I have no spanner icon and the watts are erratic - it doesn’t matter if I use 3s average of instant. The flywheel resistance also feels off

If your Zwift Hub firmware has been updated to version 5.2+, what you’re seeing with the power data flicking quickly is most likely because the Hub trainer is now capable of reporting power data 10x a second (10Hz) instead of the 1Hz it used to. More info about that here

We are aware that the power numbers can flick too quickly for some tastes and are working on that.

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Thanks, Shuji.

Just ordered the virtual shifting to go along with the 10hz power reporting. :laughing:

Same issue here. I just installed the new Hub today but the wrench icon disappears after 1 second so I have been unable to manually calibrate the new Hub. I’m just hoping it is calibrating automatically, but it is not giving me much confidence when riding.

Same issue, Updated firmware, cannot calibrate. Tried to do a group ride and was in the highest gear and was spinning like I was in small/big. Definitely not calibrated, what is going on?!

Okay, after 2 frustrating hours and no workout I think/hope I figured it out. In settings in the app, scroll all the way to the bottom where it says “Virtual Shifting”, mine was On. Why?! Thanks Zwift, aargh! I switched it to Off and the resistance came back. My time for a workout has evaporated so hopefully tomorrow I can actually ride stage 3 of the Tour of Watopia.

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I had the same thing last night after updating the firmware! Spinning my highest gear just to keep a steady pace, no way of sprinting as that was useless. Went to calibrate and no icon to do it!

I will try what you have said and hopefully get a more purposeful ride in tonight.

It worked, I just completed stage 3 of the Tour.

I’ve just tried this too and hey presto, it worked. Thank you Mitch for the time and effort of working it out!

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I am having real issues with the same problem. 90% of the time there is simply no spanner icon to click on, on the pair screen.

On a few occasions the spanner did miraculously appear but when I tried calibrate it just came up with a screen that says waiting for device and gets stuck on that. On one occasion I got a step further and it told me to pedal to a certain speed but then no speed registered despite pedalling furiously.

I really need to calibrate my hub because wattage and speed is all over the place.

Also what is ANT+ that is mentioned, I assumed I was just connected via blootooth?

another type of connection that was around long before bluetooth. You would need an ANT+ USB dongle to use it, if you have bluetooth and are satisfied then stick with bluetooth.

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I am having the same problem (wrench will sometimes not appear but when it does it disappears after a few seconds) and the Zwift Forum Manager has posted that it’s a known problem and they are working on a fix.

I can’t post a link but if you search the forums for “calibration-wrench-icon-appears-then-disappears-october-2023/612751/10” or add it after the /t/ in the forums URL you should hit the post and find the reply from Shuji on 10/21.

Until a fix comes along we will be forced to rely on the auto-calibrate feature of the Zwift hub.

Ok thanks for this. Will just have to hope auto calibrate is enough for now then.