My OTA sensor has never been accurate. I just wait until the tube currents go away. The ambient sensor on the other hand seems to be at least in the ballpark most times.
-------------------- "Don't worry about what telescope you own, or its quality. Just get out under the night sky, and enjoy God's wondrous universe." - T. M. Back
Meade RCX400-12 on JMI trolley "Ursa Major" TMB 130SS on EQ6 PRO "Ursus Polaris" Orion ED80 "Ursa Minor", WO ZS66ED "grab-'n'-go"
Canon EOS 30D (Hutech), Meade DSI, Philips ToUcam Pro