Hi - and welcome.
Congratulations on your purchase.
I am no expert but methinks you have lost 12 volt supply to the duovalves -- they fail to the hot setting.
A search in this forum on duovalve/heat/electrical should yield an answer for you.
Happy New Year
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K