||There is no direct compatible replacement for the TR019 Steam Shower Control Pad and they are difficult to locate as they are based on older technology.
The only solution we can offer is a later generation styled control pad; MK220. This is a similar sized pad and offers the same functions however you may need to make a small adjustment to house the slightly different shaped cut out needed.
Additionally, since he new pad communicates different to the TR109, you would need to replace the steam generator and matching electronics also.
This information is also applicable for other control pad alternatives, such as the TR016, which can be upgraded to MK117, again with some adjustment to the fitting hole in the tower.