All right then a few questions. Contact me via email and I'll look into your service order. Did you receive a delivery confirmation of your RX from Hitec Service?
The Micro O5S RX depicted at the web page link below is the unit you have difficulty with, right?
http://hitecrcd.com/Receivers/HFS05Ms.htm
We've used these RX's since they were prototyped exclusively with electric planes without a hitch for over a year now. What kind of ESC do you have? Did you change any installation specific wirings and or components around when you swapped out the Micro for the working RX?