[Wizza]

Mark,

Most likely you forgot to install the pull up resistor on the DHT22 Dat line, or the sensor is faulty.
The TX unit you are using is on a breadboard, so its easy to test the DHT22 alone.

There isn't any error on the code which reads the DHT22 sensor.

Hi Werk,  These are the first of the new PCBs (TX / Pro2+ RX) that I got recently, and will be heading to a mate in Syd, once ready to go.  I'll check the pull-up resistor on the I/O line.

Mark R