I sent you a response last night with some suggestions to fix your smoker issue but it's not showing yet........maybe the site's monitors are reviewing it first before making it visible?
Okay, my mistake.........I responded to this issue on the MyLargeScale.com forum........Marc had posted his smoke generator issue on both forums. So, to share my response to him on that forum, I'm posting it below for those interested in my suggestions.
My Comments:
I checked the LGB 23194 Parts Diagram and, as I recall with these factory-installed Onboard decoders, the smoker is connected to a two-pin terminal. I believe this terminal has the function built into the board for F7 On/Off and there's no option to change the F key assignment or verify the assignment of F7. However, you could do a decoder reset as shown on your locomotive's CV Listing CV55 = 55 to see if that might fix the issue with the smoker's terminal activation with F7.
If that doesn't fix your issue, you could replace the existing 5v. smoker with an 18v. or 24v. smoke generator and remove the wires from the exising smoker terminals and solder the wires directly to the track power terminals on the connector to the motor block. I normally use 18v. smokers since most DCC systems output about 20 volts to the track and the smoker can handle the additional few volts. If your DCC system outputs 22- 24 volts to the track, I'd then use the 24v. smoker. Your smoker will be always powered connected to track power, which doesn't harm it, you only loose the ability to turn it on and off with your DCC throttle.......no big deal!
Another option: Send an email to Frank Noller, Massoth's customer support, at
hotline@massoth.de and ask him if there's anything you can do to get the smoker's terminal to activate with F7. Massoth made all the LGB electronics for LGB locomotives until 2014 when Marklin started installing their own DCC decoders, the MSD3 mfx/dcc/dc decoder.