# 2 Groups hard to switch on Shelly Wave Pro Dimmer 2PM
**URL:** https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339
**Category:** Devices
**Tags:** z-wave
**Created:** [September 23, 2025, 6:10pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339 "2025-09-23T18:10:43Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Chrisvr254](https://community.homey.app/u/Chrisvr254)
#### Post date: [September 23, 2025, 6:10pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/1 "2025-09-23T18:10:43Z")
Hi there I bought 3 Shelly Wave Pro Dimmers 2PM, which has 2 groups to switch and dim. But it seems Homey has troubles to switch both groups on the same dimmer. One group / switch is always worling smooth but the 2nd switch/group on the dimmer is most of the times timeouts or not able to dim seperately.
Are there some adjustments I can make to make it perfom better?
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### Author:  [@robertklep](https://community.homey.app/u/robertklep)
#### Post date: [September 23, 2025, 6:14pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/2 "2025-09-23T18:14:42Z")
Do you mean you’re switching/dimming both at the same time from a flow?
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### Author:  [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)
#### Post date: [September 23, 2025, 6:41pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/3 "2025-09-23T18:41:13Z")
Sounds like it…
@Chrisvr254 in advanced flow, connect the action card in series, this adds a slight delay.
In standard flow, add a 1s delay between both cards. Unfortunately 1s is the smallest delay in one flow.
Why? Homey sends all action cards at once, not synchronised. This often results in randomly one or more unresponding devices.
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### Author:  [@Chrisvr254](https://community.homey.app/u/Chrisvr254)
#### Post date: [September 23, 2025, 7:12pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/4 "2025-09-23T19:12:29Z")
no I mean - see screenshot - I have 2 dinrail dimmers installed for switchimg and dimmu g 4 groups. Focus on the Dimmer Right, 2 light groups are connected, Spots and Led strip. If I switch in SpOts achter DimR, the spots are on and I can dim to certain levels easily. I have no flow set yet, I have just connected both dimmers to Homey
If I switch on Led strip DimR, it takes a while or it never goes on.
I then Switch on DimmerR which powers on both Spots achter DimR and Led strip DimR. Grom that moment I can dim to certain levels and on Dimmer R for both Spots achter and Led strip. But seperate switch and dim both Groups does not go smooth
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### Author:  [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)
#### Post date: [September 23, 2025, 7:48pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/5 "2025-09-23T19:48:59Z")
Where’s the screenshot ?
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### Author:  [@Chrisvr254](https://community.homey.app/u/Chrisvr254)
#### Post date: [September 24, 2025, 8:34pm UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/6 "2025-09-24T20:34:23Z")
 Here it is
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### Author:  [@Daan\_S](https://community.homey.app/u/Daan_S)
#### Post date: [November 3, 2025, 10:05am UTC](https://community.homey.app/t/2-groups-hard-to-switch-on-shelly-wave-pro-dimmer-2pm/143339/7 "2025-11-03T10:05:06Z")
I’ve installed 3 Shelly wave dimmer pro PM2’s.
One of them seems to have a mind of its own resulting in multiple on switches (where in homey it is still switched off). There is no button press and it is the whole two groups that are switched on. If it was only one of the two groups it could be wrong wiring resulting in unintentional switching, but because it is the dimmer with two groups together I am suspecting something is wrong with the whole din dimmer or strange behavior of homey trying to cope with the device. I’ve tried recalibrating and removing and adding it to homey again but it does not change the issue.