i had an look at my PCB and indeed there was an fault but it was in my RX now it works perfectly!!!!
but i had one more question in the program receiveExample1 you have some message's regarding the RC20 thermostat but do you already looked into the messages for the RC35?
i also will look into the messages and try to change them.
this are the messages.
// 0x91 and 0xA8 are specific to the RC20 and are setting regarding the thermostat.
// If you have f.i. a RC35 you need to set other messages here.
0x10,0x91,0x01,0x04, //#13 12 setpoint room temperature x 2
0x10,0x91,0x02,0x05, //#14 13 room temperature x 10
0x10,0xA8,0x17,0x81, //#15 14 setting 0=low, 1=manual, 2=clock
0x10,0xA8,0x1C,0x84, //#16 15 overruled clock setting x 2 ( 0 = not overruled)
0x10,0xA8,0x1D,0x84 //#17 16 manual setpoint temperature x 2
kind regards Patrick Postma